72167650865 has 16 divisors (see below), whose sum is σ = 89765625600. Its totient is φ = 55632411072.

The previous prime is 72167650853. The next prime is 72167650879. The reversal of 72167650865 is 56805676127.

It is a cyclic number.

It is not a de Polignac number, because 72167650865 - 2³² = 67872683569 is a prime.

It is a super-4 number, since 4×72167650865⁴ (a number of 45 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421805 + ... + 567674.

It is an arithmetic number, because the mean of its divisors is an integer number (5610351600).

Almost surely, 2^72167650865 is an apocalyptic number.

It is an amenable number.

72167650865 is a deficient number, since it is larger than the sum of its proper divisors (17597974735).

72167650865 is a wasteful number, since it uses less digits than its factorization.

72167650865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990016.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 72167650865 in words is "seventy-two billion, one hundred sixty-seven million, six hundred fifty thousand, eight hundred sixty-five".