72717372031 has 2 divisors, whose sum is σ = 72717372032. Its totient is φ = 72717372030.

The previous prime is 72717371989. The next prime is 72717372083. The reversal of 72717372031 is 13027371727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72717372031 - 2¹¹ = 72717369983 is a prime.

It is a super-2 number, since 2×72717372031² (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 (72717372131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36358686015 + 36358686016.

It is an arithmetic number, because the mean of its divisors is an integer number (36358686016).

Almost surely, 2^72717372031 is an apocalyptic number.

72717372031 is a deficient number, since it is larger than the sum of its proper divisors (1).

72717372031 is an equidigital number, since it uses as much as digits as its factorization.

72717372031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86436, while the sum is 40.

The spelling of 72717372031 in words is "seventy-two billion, seven hundred seventeen million, three hundred seventy-two thousand, thirty-one".