19896646625 has 16 divisors (see below), whose sum is σ = 25201637760. Its totient is φ = 15679738800.

The previous prime is 19896646597. The next prime is 19896646633. The reversal of 19896646625 is 52664669891.

It is not a de Polignac number, because 19896646625 - 2¹⁸ = 19896384481 is a prime.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1179485 + ... + 1196234.

It is an arithmetic number, because the mean of its divisors is an integer number (1575102360).

Almost surely, 2^19896646625 is an apocalyptic number.

It is an amenable number.

19896646625 is a deficient number, since it is larger than the sum of its proper divisors (5304991135).

19896646625 is an equidigital number, since it uses as much as digits as its factorization.

19896646625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375801 (or 2375791 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 62.

The spelling of 19896646625 in words is "nineteen billion, eight hundred ninety-six million, six hundred forty-six thousand, six hundred twenty-five".