25425247779 has 12 divisors (see below), whose sum is σ = 36789909000. Its totient is φ = 16920372384.

The previous prime is 25425247759. The next prime is 25425247789. The reversal of 25425247779 is 97774252452.

25425247779 is a `hidden beast` number, since 2 + 5 + 42 + 524 + 7 + 7 + 79 = 666.

It is not a de Polignac number, because 25425247779 - 2¹¹ = 25425245731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25425247759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2477329 + ... + 2487570.

It is an arithmetic number, because the mean of its divisors is an integer number (3065825750).

Almost surely, 2^25425247779 is an apocalyptic number.

25425247779 is a deficient number, since it is larger than the sum of its proper divisors (11364661221).

25425247779 is a wasteful number, since it uses less digits than its factorization.

25425247779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4965474 (or 4965471 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 54.

The spelling of 25425247779 in words is "twenty-five billion, four hundred twenty-five million, two hundred forty-seven thousand, seven hundred seventy-nine".