25696681 has 4 divisors (see below), whose sum is σ = 26813952. Its totient is φ = 24579412.

The previous prime is 25696669. The next prime is 25696691. The reversal of 25696681 is 18669652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25696681 - 2¹³ = 25688489 is a prime.

It is a super-2 number, since 2×25696681² = 1320638828831522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25696691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558601 + ... + 558646.

It is an arithmetic number, because the mean of its divisors is an integer number (6703488).

Almost surely, 2^25696681 is an apocalyptic number.

It is an amenable number.

25696681 is a deficient number, since it is larger than the sum of its proper divisors (1117271).

25696681 is a wasteful number, since it uses less digits than its factorization.

25696681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117270.

The product of its digits is 155520, while the sum is 43.

The square root of 25696681 is about 5069.1893829290. The cubic root of 25696681 is about 295.0930703179.

The spelling of 25696681 in words is "twenty-five million, six hundred ninety-six thousand, six hundred eighty-one".