25973694523 has 4 divisors (see below), whose sum is σ = 29684222320. Its totient is φ = 22263166728.

The previous prime is 25973694499. The next prime is 25973694533. The reversal of 25973694523 is 32549637952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25973694523 - 2²¹ = 25971597371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25973694533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855263888 + ... + 1855263901.

It is an arithmetic number, because the mean of its divisors is an integer number (7421055580).

Almost surely, 2^25973694523 is an apocalyptic number.

25973694523 is a deficient number, since it is larger than the sum of its proper divisors (3710527797).

25973694523 is an equidigital number, since it uses as much as digits as its factorization.

25973694523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710527796.

The product of its digits is 12247200, while the sum is 55.

The spelling of 25973694523 in words is "twenty-five billion, nine hundred seventy-three million, six hundred ninety-four thousand, five hundred twenty-three".