25553956858 has 4 divisors (see below), whose sum is σ = 38330935290. Its totient is φ = 12776978428.

The previous prime is 25553956817. The next prime is 25553956913. The reversal of 25553956858 is 85865935552.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 21179854089 + 4374102769 = 145533^2 + 66137^2 .

It is a super-2 number, since 2×25553956858² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25553956796 and 25553956805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6388489213 + ... + 6388489216.

Almost surely, 2^25553956858 is an apocalyptic number.

25553956858 is a deficient number, since it is larger than the sum of its proper divisors (12776978432).

25553956858 is a wasteful number, since it uses less digits than its factorization.

25553956858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12776978431.

The product of its digits is 64800000, while the sum is 61.

The spelling of 25553956858 in words is "twenty-five billion, five hundred fifty-three million, nine hundred fifty-six thousand, eight hundred fifty-eight".