72602007721 has 2 divisors, whose sum is σ = 72602007722. Its totient is φ = 72602007720.

The previous prime is 72602007707. The next prime is 72602007727. The reversal of 72602007721 is 12770020627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36954679696 + 35647328025 = 192236^2 + 188805^2 .

It is a cyclic number.

It is not a de Polignac number, because 72602007721 - 2⁵ = 72602007689 is a prime.

It is a super-2 number, since 2×72602007721² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72602007727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36301003860 + 36301003861.

It is an arithmetic number, because the mean of its divisors is an integer number (36301003861).

Almost surely, 2^72602007721 is an apocalyptic number.

It is an amenable number.

72602007721 is a deficient number, since it is larger than the sum of its proper divisors (1).

72602007721 is an equidigital number, since it uses as much as digits as its factorization.

72602007721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The spelling of 72602007721 in words is "seventy-two billion, six hundred two million, seven thousand, seven hundred twenty-one".