25474747779 has 48 divisors (see below), whose sum is σ = 41158720512. Its totient is φ = 15652489248.

The previous prime is 25474747763. The next prime is 25474747787. The reversal of 25474747779 is 97774747452.

25474747779 is a `hidden beast` number, since 2 + 54 + 7 + 47 + 477 + 79 = 666.

It is not a de Polignac number, because 25474747779 - 2⁴ = 25474747763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25474747729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2151694 + ... + 2163500.

It is an arithmetic number, because the mean of its divisors is an integer number (857473344).

Almost surely, 2^25474747779 is an apocalyptic number.

25474747779 is a deficient number, since it is larger than the sum of its proper divisors (15683972733).

25474747779 is a wasteful number, since it uses less digits than its factorization.

25474747779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12518 (or 12506 counting only the distinct ones).

The product of its digits is 96808320, while the sum is 63.

The spelling of 25474747779 in words is "twenty-five billion, four hundred seventy-four million, seven hundred forty-seven thousand, seven hundred seventy-nine".