19971495025 has 48 divisors (see below), whose sum is σ = 27317537280. Its totient is φ = 14417740800.

The previous prime is 19971495001. The next prime is 19971495053. The reversal of 19971495025 is 52059417991.

It is not a de Polignac number, because 19971495025 - 2⁷ = 19971494897 is a prime.

It is a super-2 number, since 2×19971495025² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) 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 47 ways as a sum of consecutive naturals, for example, 1429122 + ... + 1443028.

It is an arithmetic number, because the mean of its divisors is an integer number (569115360).

Almost surely, 2^19971495025 is an apocalyptic number.

It is an amenable number.

19971495025 is a deficient number, since it is larger than the sum of its proper divisors (7346042255).

19971495025 is a wasteful number, since it uses less digits than its factorization.

19971495025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14074 (or 14069 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 19971495025 in words is "nineteen billion, nine hundred seventy-one million, four hundred ninety-five thousand, twenty-five".