265645651012506 has 20 divisors (see below), whose sum is σ = 595243032824682. Its totient is φ = 88548550337448.

The previous prime is 265645651012477. The next prime is 265645651012513. The reversal of 265645651012506 is 605210156546562.

265645651012506 is a `hidden beast` number, since 2 + 6 + 5 + 6 + 4 + 565 + 10 + 12 + 50 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 222572353861881 + 43073297150625 = 14918859^2 + 6563025^2 .

It is a super-2 number, since 2×265645651012506² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 819893984445 + ... + 819893984768.

Almost surely, 2^{265645651012506} is an apocalyptic number.

265645651012506 is an abundant number, since it is smaller than the sum of its proper divisors (329597381812176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265645651012506 is a wasteful number, since it uses less digits than its factorization.

265645651012506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639787969227 (or 1639787969218 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 265645651012506 in words is "two hundred sixty-five trillion, six hundred forty-five billion, six hundred fifty-one million, twelve thousand, five hundred six".