265553320665 has 16 divisors (see below), whose sum is σ = 430869614976. Its totient is φ = 139633670400.

The previous prime is 265553320651. The next prime is 265553320667. The reversal of 265553320665 is 566023355562.

It is not a de Polignac number, because 265553320665 - 2⁴ = 265553320649 is a prime.

It is a super-2 number, since 2×265553320665² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (265553320667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124671856 + ... + 124673985.

It is an arithmetic number, because the mean of its divisors is an integer number (26929350936).

Almost surely, 2^265553320665 is an apocalyptic number.

It is an amenable number.

265553320665 is a deficient number, since it is larger than the sum of its proper divisors (165316294311).

265553320665 is a wasteful number, since it uses less digits than its factorization.

265553320665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249345920.

The product of its (nonzero) digits is 4860000, while the sum is 48.

The spelling of 265553320665 in words is "two hundred sixty-five billion, five hundred fifty-three million, three hundred twenty thousand, six hundred sixty-five".