25049779856 has 10 divisors (see below), whose sum is σ = 48533948502. Its totient is φ = 12524889920.

The previous prime is 25049779789. The next prime is 25049779897. The reversal of 25049779856 is 65897794052.

It can be written as a sum of positive squares in only one way, i.e., 17817978256 + 7231801600 = 133484^2 + 85040^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782805605 + ... + 782805636.

Almost surely, 2^25049779856 is an apocalyptic number.

It is an amenable number.

25049779856 is a deficient number, since it is larger than the sum of its proper divisors (23484168646).

25049779856 is a wasteful number, since it uses less digits than its factorization.

25049779856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565611249 (or 1565611243 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 62.

The spelling of 25049779856 in words is "twenty-five billion, forty-nine million, seven hundred seventy-nine thousand, eight hundred fifty-six".