721525072323631 has 2 divisors, whose sum is σ = 721525072323632. Its totient is φ = 721525072323630.

The previous prime is 721525072323623. The next prime is 721525072323697. The reversal of 721525072323631 is 136323270525127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721525072323631 - 2³ = 721525072323623 is a prime.

It is a super-2 number, since 2×721525072323631² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721525072326631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360762536161815 + 360762536161816.

It is an arithmetic number, because the mean of its divisors is an integer number (360762536161816).

Almost surely, 2^{721525072323631} is an apocalyptic number.

721525072323631 is a deficient number, since it is larger than the sum of its proper divisors (1).

721525072323631 is an equidigital number, since it uses as much as digits as its factorization.

721525072323631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 49.

The spelling of 721525072323631 in words is "seven hundred twenty-one trillion, five hundred twenty-five billion, seventy-two million, three hundred twenty-three thousand, six hundred thirty-one".