25738697881 has 4 divisors (see below), whose sum is σ = 27718597732. Its totient is φ = 23758798032.

The previous prime is 25738697861. The next prime is 25738697891. The reversal of 25738697881 is 18879683752.

It is a happy number.

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 9377985600 + 16360712281 = 96840^2 + 127909^2 .

It is a cyclic number.

It is not a de Polignac number, because 25738697881 - 2⁵ = 25738697849 is a prime.

It is a super-2 number, since 2×25738697881² (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 (25738697861) 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, 989949906 + ... + 989949931.

It is an arithmetic number, because the mean of its divisors is an integer number (6929649433).

Almost surely, 2^25738697881 is an apocalyptic number.

It is an amenable number.

25738697881 is a deficient number, since it is larger than the sum of its proper divisors (1979899851).

25738697881 is a wasteful number, since it uses less digits than its factorization.

25738697881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979899850.

The product of its digits is 40642560, while the sum is 64.

The spelling of 25738697881 in words is "twenty-five billion, seven hundred thirty-eight million, six hundred ninety-seven thousand, eight hundred eighty-one".