265660642151550 has 96 divisors (see below), whose sum is σ = 775103991285600. Its totient is φ = 66675612142080.

The previous prime is 265660642151503. The next prime is 265660642151561. The reversal of 265660642151550 is 55151246066562.

265660642151550 is a `hidden beast` number, since 2 + 6 + 5 + 6 + 6 + 0 + 64 + 21 + 5 + 1 + 550 = 666.

It is a super-2 number, since 2×265660642151550² (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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5787790605 + ... + 5787836504.

It is an arithmetic number, because the mean of its divisors is an integer number (8073999909225).

Almost surely, 2^{265660642151550} is an apocalyptic number.

265660642151550 is an abundant number, since it is smaller than the sum of its proper divisors (509443349134050).

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

265660642151550 is a wasteful number, since it uses less digits than its factorization.

265660642151550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11575627147 (or 11575627136 counting only the distinct ones).

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

The spelling of 265660642151550 in words is "two hundred sixty-five trillion, six hundred sixty billion, six hundred forty-two million, one hundred fifty-one thousand, five hundred fifty".