640551411 has 6 divisors (see below), whose sum is σ = 925240940. Its totient is φ = 427034268.

The previous prime is 640551409. The next prime is 640551413. The reversal of 640551411 is 114155046.

640551411 is a `hidden beast` number, since 640 + 5 + 5 + 1 + 4 + 11 = 666.

640551411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640551409) and next prime (640551413).

It is not a de Polignac number, because 640551411 - 2¹ = 640551409 is a prime.

It is a super-2 number, since 2×640551411² = 820612220268181842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640551413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35586181 + ... + 35586198.

Almost surely, 2^640551411 is an apocalyptic number.

640551411 is a deficient number, since it is larger than the sum of its proper divisors (284689529).

640551411 is a wasteful number, since it uses less digits than its factorization.

640551411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71172385 (or 71172382 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 640551411 is about 25309.1171517301. The cubic root of 640551411 is about 862.0213005900.

The spelling of 640551411 in words is "six hundred forty million, five hundred fifty-one thousand, four hundred eleven".