25505077578 has 16 divisors (see below), whose sum is σ = 52655644416. Its totient is φ = 8227444320.

The previous prime is 25505077561. The next prime is 25505077601. The reversal of 25505077578 is 87577050552.

It is a self number, because there is not a number n which added to its sum of digits gives 25505077578.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68561851 + ... + 68562222.

It is an arithmetic number, because the mean of its divisors is an integer number (3290977776).

Almost surely, 2^25505077578 is an apocalyptic number.

25505077578 is an abundant number, since it is smaller than the sum of its proper divisors (27150566838).

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

25505077578 is a wasteful number, since it uses less digits than its factorization.

25505077578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137124109.

The product of its (nonzero) digits is 3430000, while the sum is 51.

The spelling of 25505077578 in words is "twenty-five billion, five hundred five million, seventy-seven thousand, five hundred seventy-eight".