665756145 has 64 divisors (see below), whose sum is σ = 1206766080. Its totient is φ = 348192000.

The previous prime is 665756141. The next prime is 665756149. The reversal of 665756145 is 541657566.

665756145 is a `hidden beast` number, since 66 + 575 + 6 + 14 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (665756141) and next prime (665756149).

It is not a de Polignac number, because 665756145 - 2² = 665756141 is a prime.

It is a super-2 number, since 2×665756145² = 886462489210522050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 665756145.

It is not an unprimeable number, because it can be changed into a prime (665756141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2140540 + ... + 2140850.

It is an arithmetic number, because the mean of its divisors is an integer number (18855720).

Almost surely, 2^665756145 is an apocalyptic number.

It is an amenable number.

665756145 is a deficient number, since it is larger than the sum of its proper divisors (541009935).

665756145 is a wasteful number, since it uses less digits than its factorization.

665756145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583 (or 577 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 665756145 is about 25802.2507739151. The cubic root of 665756145 is about 873.1825765680.

The spelling of 665756145 in words is "six hundred sixty-five million, seven hundred fifty-six thousand, one hundred forty-five".