721535852265 has 32 divisors (see below), whose sum is σ = 1176632593920. Its totient is φ = 377432230656.

The previous prime is 721535852251. The next prime is 721535852267. The reversal of 721535852265 is 562258535127.

It is not a de Polignac number, because 721535852265 - 2²⁸ = 721267416809 is a prime.

It is a super-2 number, since 2×721535852265² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721535852267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2253171 + ... + 2553399.

It is an arithmetic number, because the mean of its divisors is an integer number (36769768560).

Almost surely, 2^721535852265 is an apocalyptic number.

It is an amenable number.

721535852265 is a deficient number, since it is larger than the sum of its proper divisors (455096741655).

721535852265 is a wasteful number, since it uses less digits than its factorization.

721535852265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303313.

The product of its digits is 5040000, while the sum is 51.

The spelling of 721535852265 in words is "seven hundred twenty-one billion, five hundred thirty-five million, eight hundred fifty-two thousand, two hundred sixty-five".