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640665113 = 1125399901
BaseRepresentation
bin100110001011111…
…100011000011001
31122122112011022112
4212023330120121
52303002240423
6143323402105
721606364214
oct4613743031
91578464275
10640665113
112a9703200
1215a683335
13a29660aa
146113077b
153b3a1a78
hex262fc619

640665113 has 12 divisors (see below), whose sum is σ = 717496164. Its totient is φ = 571428000.

The previous prime is 640665061. The next prime is 640665121. The reversal of 640665113 is 311566046.

640665113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 560884489 + 79780624 = 23683^2 + 8932^2 .

It is not a de Polignac number, because 640665113 - 212 = 640661017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640665113.

It is not an unprimeable number, because it can be changed into a prime (640665133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43538 + ... + 56363.

It is an arithmetic number, because the mean of its divisors is an integer number (59791347).

Almost surely, 2640665113 is an apocalyptic number.

It is an amenable number.

640665113 is a deficient number, since it is larger than the sum of its proper divisors (76831051).

640665113 is a wasteful number, since it uses less digits than its factorization.

640665113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99976 (or 99965 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 640665113 is about 25311.3633176880. The cubic root of 640665113 is about 862.0723023495.

The spelling of 640665113 in words is "six hundred forty million, six hundred sixty-five thousand, one hundred thirteen".

Divisors: 1 11 53 121 583 6413 99901 1098911 5294753 12088021 58242283 640665113