25547875978 has 8 divisors (see below), whose sum is σ = 40576038372. Its totient is φ = 12022529856.

The previous prime is 25547875939. The next prime is 25547875987. The reversal of 25547875978 is 87957874552.

It can be written as a sum of positive squares in 2 ways, for example, as 25547866569 + 9409 = 159837^2 + 97^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375704025 + ... + 375704092.

Almost surely, 2^25547875978 is an apocalyptic number.

25547875978 is a deficient number, since it is larger than the sum of its proper divisors (15028162394).

25547875978 is a wasteful number, since it uses less digits than its factorization.

25547875978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751408136.

The product of its digits is 197568000, while the sum is 67.

The spelling of 25547875978 in words is "twenty-five billion, five hundred forty-seven million, eight hundred seventy-five thousand, nine hundred seventy-eight".