25705178920 has 64 divisors (see below), whose sum is σ = 61761139200. Its totient is φ = 9607261440.

The previous prime is 25705178911. The next prime is 25705178921. The reversal of 25705178920 is 2987150752.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25705178921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321454 + ... + 393373.

It is an arithmetic number, because the mean of its divisors is an integer number (965017800).

Almost surely, 2^25705178920 is an apocalyptic number.

25705178920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25705178920 is an abundant number, since it is smaller than the sum of its proper divisors (36055960280).

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

25705178920 is a wasteful number, since it uses less digits than its factorization.

25705178920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714898 (or 714894 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 25705178920 in words is "twenty-five billion, seven hundred five million, one hundred seventy-eight thousand, nine hundred twenty".