72155504313631 has 2 divisors, whose sum is σ = 72155504313632. Its totient is φ = 72155504313630.

The previous prime is 72155504313617. The next prime is 72155504313647. The reversal of 72155504313631 is 13631340555127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72155504313631 - 2³³ = 72146914379039 is a prime.

It is a super-2 number, since 2×72155504313631² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72155504313661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36077752156815 + 36077752156816.

It is an arithmetic number, because the mean of its divisors is an integer number (36077752156816).

Almost surely, 2^{72155504313631} is an apocalyptic number.

72155504313631 is a deficient number, since it is larger than the sum of its proper divisors (1).

72155504313631 is an equidigital number, since it uses as much as digits as its factorization.

72155504313631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134000, while the sum is 46.

Adding to 72155504313631 its reverse (13631340555127), we get a palindrome (85786844868758).

The spelling of 72155504313631 in words is "seventy-two trillion, one hundred fifty-five billion, five hundred four million, three hundred thirteen thousand, six hundred thirty-one".