72128631651 has 16 divisors (see below), whose sum is σ = 96349270560. Its totient is φ = 47996928000.

The previous prime is 72128631637. The next prime is 72128631671. The reversal of 72128631651 is 15613682127.

It is a happy number.

It is not a de Polignac number, because 72128631651 - 2⁹ = 72128631139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72128631671) 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, 8073555 + ... + 8082483.

It is an arithmetic number, because the mean of its divisors is an integer number (6021829410).

Almost surely, 2^72128631651 is an apocalyptic number.

72128631651 is a deficient number, since it is larger than the sum of its proper divisors (24220638909).

72128631651 is a wasteful number, since it uses less digits than its factorization.

72128631651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13606.

The product of its digits is 120960, while the sum is 42.

The spelling of 72128631651 in words is "seventy-two billion, one hundred twenty-eight million, six hundred thirty-one thousand, six hundred fifty-one".