25391996927 has 4 divisors (see below), whose sum is σ = 27700360296. Its totient is φ = 23083633560.

The previous prime is 25391996923. The next prime is 25391996933. The reversal of 25391996927 is 72969919352.

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 25391996927 - 2² = 25391996923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25391996927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25391996923) 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, 1154181668 + ... + 1154181689.

It is an arithmetic number, because the mean of its divisors is an integer number (6925090074).

Almost surely, 2^25391996927 is an apocalyptic number.

25391996927 is a deficient number, since it is larger than the sum of its proper divisors (2308363369).

25391996927 is a wasteful number, since it uses less digits than its factorization.

25391996927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308363368.

The product of its digits is 16533720, while the sum is 62.

The spelling of 25391996927 in words is "twenty-five billion, three hundred ninety-one million, nine hundred ninety-six thousand, nine hundred twenty-seven".