25122666858 has 16 divisors (see below), whose sum is σ = 50251189440. Its totient is φ = 8373246336.

The previous prime is 25122666851. The next prime is 25122666917. The reversal of 25122666858 is 85866622152.

It is a super-2 number, since 2×25122666858² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25122666858.

It is not an unprimeable number, because it can be changed into a prime (25122666851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187198 + ... + 292041.

It is an arithmetic number, because the mean of its divisors is an integer number (3140699340).

Almost surely, 2^25122666858 is an apocalyptic number.

25122666858 is an abundant number, since it is smaller than the sum of its proper divisors (25128522582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25122666858 is a wasteful number, since it uses less digits than its factorization.

25122666858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487981.

The product of its digits is 2764800, while the sum is 51.

The spelling of 25122666858 in words is "twenty-five billion, one hundred twenty-two million, six hundred sixty-six thousand, eight hundred fifty-eight".