99125634721 has 2 divisors, whose sum is σ = 99125634722. Its totient is φ = 99125634720.

The previous prime is 99125634703. The next prime is 99125634793. The reversal of 99125634721 is 12743652199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83729788321 + 15395846400 = 289361^2 + 124080^2 .

It is a cyclic number.

It is not a de Polignac number, because 99125634721 - 2⁷ = 99125634593 is a prime.

It is a super-2 number, since 2×99125634721² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99125634121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49562817360 + 49562817361.

It is an arithmetic number, because the mean of its divisors is an integer number (49562817361).

Almost surely, 2^99125634721 is an apocalyptic number.

It is an amenable number.

99125634721 is a deficient number, since it is larger than the sum of its proper divisors (1).

99125634721 is an equidigital number, since it uses as much as digits as its factorization.

99125634721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The spelling of 99125634721 in words is "ninety-nine billion, one hundred twenty-five million, six hundred thirty-four thousand, seven hundred twenty-one".