25912932978 has 16 divisors (see below), whose sum is σ = 51834335616. Its totient is φ = 8636232720.

The previous prime is 25912932973. The next prime is 25912932979. The reversal of 25912932978 is 87923921952.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25912932973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312778 + ... + 386853.

It is an arithmetic number, because the mean of its divisors is an integer number (3239645976).

Almost surely, 2^25912932978 is an apocalyptic number.

25912932978 is an abundant number, since it is smaller than the sum of its proper divisors (25921402638).

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

25912932978 is a wasteful number, since it uses less digits than its factorization.

25912932978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705809.

The product of its digits is 4898880, while the sum is 57.

The spelling of 25912932978 in words is "twenty-five billion, nine hundred twelve million, nine hundred thirty-two thousand, nine hundred seventy-eight".