25785705477 has 16 divisors (see below), whose sum is σ = 39601897472. Its totient is φ = 14618666160.

The previous prime is 25785705469. The next prime is 25785705487. The reversal of 25785705477 is 77450758752.

It is not a de Polignac number, because 25785705477 - 2³ = 25785705469 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25785705427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4831549 + ... + 4836882.

It is an arithmetic number, because the mean of its divisors is an integer number (2475118592).

Almost surely, 2^25785705477 is an apocalyptic number.

It is an amenable number.

25785705477 is a deficient number, since it is larger than the sum of its proper divisors (13816191995).

25785705477 is a wasteful number, since it uses less digits than its factorization.

25785705477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9668568.

The product of its (nonzero) digits is 19208000, while the sum is 57.

The spelling of 25785705477 in words is "twenty-five billion, seven hundred eighty-five million, seven hundred five thousand, four hundred seventy-seven".