72865602851 has 4 divisors (see below), whose sum is σ = 76700634600. Its totient is φ = 69030571104.

The previous prime is 72865602841. The next prime is 72865602857. The reversal of 72865602851 is 15820656827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72865602851 - 2¹⁰ = 72865601827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72865602851.

It is not an unprimeable number, because it can be changed into a prime (72865602857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1917515846 + ... + 1917515883.

It is an arithmetic number, because the mean of its divisors is an integer number (19175158650).

Almost surely, 2^72865602851 is an apocalyptic number.

72865602851 is a deficient number, since it is larger than the sum of its proper divisors (3835031749).

72865602851 is a wasteful number, since it uses less digits than its factorization.

72865602851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835031748.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 72865602851 in words is "seventy-two billion, eight hundred sixty-five million, six hundred two thousand, eight hundred fifty-one".