25193097987 has 8 divisors (see below), whose sum is σ = 33603198720. Its totient is φ = 16789197960.

The previous prime is 25193097977. The next prime is 25193097989. The reversal of 25193097987 is 78979039152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25193097987 - 2⁴ = 25193097971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25193097987.

It is not an unprimeable number, because it can be changed into a prime (25193097989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540687 + ... + 1556952.

It is an arithmetic number, because the mean of its divisors is an integer number (4200399840).

Almost surely, 2^25193097987 is an apocalyptic number.

25193097987 is a deficient number, since it is larger than the sum of its proper divisors (8410100733).

25193097987 is a wasteful number, since it uses less digits than its factorization.

25193097987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100353.

The product of its (nonzero) digits is 8573040, while the sum is 60.

The spelling of 25193097987 in words is "twenty-five billion, one hundred ninety-three million, ninety-seven thousand, nine hundred eighty-seven".