25507560778 has 16 divisors (see below), whose sum is σ = 43744530240. Its totient is φ = 10927490976.

The previous prime is 25507560761. The next prime is 25507560779. The reversal of 25507560778 is 87706570552.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25507560779) 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, 323251 + ... + 394342.

It is an arithmetic number, because the mean of its divisors is an integer number (2734033140).

Almost surely, 2^25507560778 is an apocalyptic number.

25507560778 is a deficient number, since it is larger than the sum of its proper divisors (18236969462).

25507560778 is a wasteful number, since it uses less digits than its factorization.

25507560778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720141.

The product of its (nonzero) digits is 4116000, while the sum is 52.

The spelling of 25507560778 in words is "twenty-five billion, five hundred seven million, five hundred sixty thousand, seven hundred seventy-eight".