72669617631 has 24 divisors (see below), whose sum is σ = 113056245120. Its totient is φ = 44713982016.

The previous prime is 72669617599. The next prime is 72669617641. The reversal of 72669617631 is 13671696627.

It is a happy number.

It is not a de Polignac number, because 72669617631 - 2⁵ = 72669617599 is a prime.

It is a super-2 number, since 2×72669617631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72669617641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 978450 + ... + 1050096.

It is an arithmetic number, because the mean of its divisors is an integer number (4710676880).

Almost surely, 2^72669617631 is an apocalyptic number.

72669617631 is a deficient number, since it is larger than the sum of its proper divisors (40386627489).

72669617631 is a wasteful number, since it uses less digits than its factorization.

72669617631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80335 (or 80332 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The spelling of 72669617631 in words is "seventy-two billion, six hundred sixty-nine million, six hundred seventeen thousand, six hundred thirty-one".