72004922581 has 2 divisors, whose sum is σ = 72004922582. Its totient is φ = 72004922580.

The previous prime is 72004922557. The next prime is 72004922599. The reversal of 72004922581 is 18522940027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67578681681 + 4426240900 = 259959^2 + 66530^2 .

It is a cyclic number.

It is not a de Polignac number, because 72004922581 - 2⁷ = 72004922453 is a prime.

It is a super-2 number, since 2×72004922581² (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 (72004922551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36002461290 + 36002461291.

It is an arithmetic number, because the mean of its divisors is an integer number (36002461291).

Almost surely, 2^72004922581 is an apocalyptic number.

It is an amenable number.

72004922581 is a deficient number, since it is larger than the sum of its proper divisors (1).

72004922581 is an equidigital number, since it uses as much as digits as its factorization.

72004922581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 72004922581 in words is "seventy-two billion, four million, nine hundred twenty-two thousand, five hundred eighty-one".