25706991556 has 9 divisors (see below), whose sum is σ = 44987796399. Its totient is φ = 12853335444.

The previous prime is 25706991533. The next prime is 25706991577. The reversal of 25706991556 is 65519960752.

The square root of 25706991556 is 160334.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×25706991556² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25706991497 and 25706991506.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 280585 + ... + 360751.

Almost surely, 2^25706991556 is an apocalyptic number.

25706991556 is the 160334-th square number.

It is an amenable number.

25706991556 is a deficient number, since it is larger than the sum of its proper divisors (19280804843).

25706991556 is an frugal number, since it uses more digits than its factorization.

25706991556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160338 (or 80169 counting only the distinct ones).

The product of its (nonzero) digits is 5103000, while the sum is 55.

The spelling of 25706991556 in words is "twenty-five billion, seven hundred six million, nine hundred ninety-one thousand, five hundred fifty-six".