25677178081 has 9 divisors (see below), whose sum is σ = 26845969521. Its totient is φ = 24557253732.

The previous prime is 25677178067. The next prime is 25677178099. The reversal of 25677178081 is 18087177652.

The square root of 25677178081 is 160241.

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

It is not a de Polignac number, because 25677178081 - 2⁵ = 25677178049 is a prime.

It is a super-2 number, since 2×25677178081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25677178031) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3682060 + ... + 3689026.

Almost surely, 2^25677178081 is an apocalyptic number.

25677178081 is the 160241-st square number.

25677178081 is the 80121-st centered octagonal number.

It is an amenable number.

25677178081 is a deficient number, since it is larger than the sum of its proper divisors (1168791440).

25677178081 is an frugal number, since it uses more digits than its factorization.

25677178081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13980 (or 6990 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 52.

The spelling of 25677178081 in words is "twenty-five billion, six hundred seventy-seven million, one hundred seventy-eight thousand, eighty-one".