72630702721 has 2 divisors, whose sum is σ = 72630702722. Its totient is φ = 72630702720.

The previous prime is 72630702691. The next prime is 72630702733. The reversal of 72630702721 is 12720703627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66509831025 + 6120871696 = 257895^2 + 78236^2 .

It is a cyclic number.

It is not a de Polignac number, because 72630702721 - 2²⁷ = 72496484993 is a prime.

It is not a weakly prime, because it can be changed into another prime (72630702751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36315351360 + 36315351361.

It is an arithmetic number, because the mean of its divisors is an integer number (36315351361).

Almost surely, 2^72630702721 is an apocalyptic number.

It is an amenable number.

72630702721 is a deficient number, since it is larger than the sum of its proper divisors (1).

72630702721 is an equidigital number, since it uses as much as digits as its factorization.

72630702721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 37.

The spelling of 72630702721 in words is "seventy-two billion, six hundred thirty million, seven hundred two thousand, seven hundred twenty-one".