72490123621 has 2 divisors, whose sum is σ = 72490123622. Its totient is φ = 72490123620.

The previous prime is 72490123609. The next prime is 72490123631. The reversal of 72490123621 is 12632109427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56972438721 + 15517684900 = 238689^2 + 124570^2 .

It is a cyclic number.

It is not a de Polignac number, because 72490123621 - 2¹⁵ = 72490090853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72490123631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36245061810 + 36245061811.

It is an arithmetic number, because the mean of its divisors is an integer number (36245061811).

Almost surely, 2^72490123621 is an apocalyptic number.

It is an amenable number.

72490123621 is a deficient number, since it is larger than the sum of its proper divisors (1).

72490123621 is an equidigital number, since it uses as much as digits as its factorization.

72490123621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 72490123621 in words is "seventy-two billion, four hundred ninety million, one hundred twenty-three thousand, six hundred twenty-one".