72668797265 has 4 divisors (see below), whose sum is σ = 87202556724. Its totient is φ = 58135037808.

The previous prime is 72668797259. The next prime is 72668797283. The reversal of 72668797265 is 56279786627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56279786627 = 19 ⋅2962094033.

It can be written as a sum of positive squares in 2 ways, for example, as 46688837776 + 25979959489 = 216076^2 + 161183^2 .

It is a cyclic number.

It is not a de Polignac number, because 72668797265 - 2²⁰ = 72667748689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7266879722 + ... + 7266879731.

It is an arithmetic number, because the mean of its divisors is an integer number (21800639181).

Almost surely, 2^72668797265 is an apocalyptic number.

It is an amenable number.

72668797265 is a deficient number, since it is larger than the sum of its proper divisors (14533759459).

72668797265 is a wasteful number, since it uses less digits than its factorization.

72668797265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14533759458.

The product of its digits is 106686720, while the sum is 65.

The spelling of 72668797265 in words is "seventy-two billion, six hundred sixty-eight million, seven hundred ninety-seven thousand, two hundred sixty-five".