25558679854 has 4 divisors (see below), whose sum is σ = 38338019784. Its totient is φ = 12779339926.

The previous prime is 25558679843. The next prime is 25558679857. The reversal of 25558679854 is 45897685552.

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

It is a super-2 number, since 2×25558679854² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25558679857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389669962 + ... + 6389669965.

It is an arithmetic number, because the mean of its divisors is an integer number (9584504946).

Almost surely, 2^25558679854 is an apocalyptic number.

25558679854 is a deficient number, since it is larger than the sum of its proper divisors (12779339930).

25558679854 is a wasteful number, since it uses less digits than its factorization.

25558679854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12779339929.

The product of its digits is 120960000, while the sum is 64.

The spelling of 25558679854 in words is "twenty-five billion, five hundred fifty-eight million, six hundred seventy-nine thousand, eight hundred fifty-four".