19902625697 has 2 divisors, whose sum is σ = 19902625698. Its totient is φ = 19902625696.

The previous prime is 19902625651. The next prime is 19902625759. The reversal of 19902625697 is 79652620991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19765829281 + 136796416 = 140591^2 + 11696^2 .

It is a cyclic number.

It is not a de Polignac number, because 19902625697 - 2²⁰ = 19901577121 is a prime.

It is a super-2 number, since 2×19902625697² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19902625297) 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, 9951312848 + 9951312849.

It is an arithmetic number, because the mean of its divisors is an integer number (9951312849).

Almost surely, 2^19902625697 is an apocalyptic number.

It is an amenable number.

19902625697 is a deficient number, since it is larger than the sum of its proper divisors (1).

19902625697 is an equidigital number, since it uses as much as digits as its factorization.

19902625697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 19902625697 in words is "nineteen billion, nine hundred two million, six hundred twenty-five thousand, six hundred ninety-seven".