72123774631 has 2 divisors, whose sum is σ = 72123774632. Its totient is φ = 72123774630.

The previous prime is 72123774623. The next prime is 72123774689. The reversal of 72123774631 is 13647732127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72123774631 - 2³ = 72123774623 is a prime.

It is a super-2 number, since 2×72123774631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72123772631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36061887315 + 36061887316.

It is an arithmetic number, because the mean of its divisors is an integer number (36061887316).

Almost surely, 2^72123774631 is an apocalyptic number.

72123774631 is a deficient number, since it is larger than the sum of its proper divisors (1).

72123774631 is an equidigital number, since it uses as much as digits as its factorization.

72123774631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 43.

The spelling of 72123774631 in words is "seventy-two billion, one hundred twenty-three million, seven hundred seventy-four thousand, six hundred thirty-one".