25385835978 has 24 divisors (see below), whose sum is σ = 55006438500. Its totient is φ = 8461361664.

The previous prime is 25385835967. The next prime is 25385836019. The reversal of 25385835978 is 87953858352.

25385835978 is a `hidden beast` number, since 2 + 5 + 38 + 5 + 8 + 3 + 597 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20331052569 + 5054783409 = 142587^2 + 71097^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 279348 + ... + 358896.

Almost surely, 2^25385835978 is an apocalyptic number.

25385835978 is an abundant number, since it is smaller than the sum of its proper divisors (29620602522).

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

25385835978 is a wasteful number, since it uses less digits than its factorization.

25385835978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97286 (or 97283 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 63.

The spelling of 25385835978 in words is "twenty-five billion, three hundred eighty-five million, eight hundred thirty-five thousand, nine hundred seventy-eight".