25662881 has 4 divisors (see below), whose sum is σ = 25705092. Its totient is φ = 25620672.

The previous prime is 25662839. The next prime is 25662899. The reversal of 25662881 is 18826652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2430481 + 23232400 = 1559^2 + 4820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25662881 is a prime.

It is a super-2 number, since 2×25662881² = 1317166922440322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25662821) 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, 20180 + ... + 21413.

It is an arithmetic number, because the mean of its divisors is an integer number (6426273).

Almost surely, 2^25662881 is an apocalyptic number.

It is an amenable number.

25662881 is a deficient number, since it is larger than the sum of its proper divisors (42211).

25662881 is an equidigital number, since it uses as much as digits as its factorization.

25662881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42210.

The product of its digits is 46080, while the sum is 38.

The square root of 25662881 is about 5065.8544195427. The cubic root of 25662881 is about 294.9636304871.

The spelling of 25662881 in words is "twenty-five million, six hundred sixty-two thousand, eight hundred eighty-one".