25551658881 has 24 divisors (see below), whose sum is σ = 42810083264. Its totient is φ = 14383020960.

The previous prime is 25551658877. The next prime is 25551658889. The reversal of 25551658881 is 18885615552.

25551658881 is a `hidden beast` number, since 2 + 5 + 5 + 51 + 6 + 588 + 8 + 1 = 666.

It is not a de Polignac number, because 25551658881 - 2² = 25551658877 is a prime.

It is a super-2 number, since 2×25551658881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25551658889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3022510 + ... + 3030951.

Almost surely, 2^25551658881 is an apocalyptic number.

25551658881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25551658881 is a deficient number, since it is larger than the sum of its proper divisors (17258424383).

25551658881 is a wasteful number, since it uses less digits than its factorization.

25551658881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6053541 (or 6053538 counting only the distinct ones).

The product of its digits is 3840000, while the sum is 54.

The spelling of 25551658881 in words is "twenty-five billion, five hundred fifty-one million, six hundred fifty-eight thousand, eight hundred eighty-one".