25917278931 has 12 divisors (see below), whose sum is σ = 38306676408. Its totient is φ = 16876367424.

The previous prime is 25917278921. The next prime is 25917278951. The reversal of 25917278931 is 13987271952.

It is a happy number.

It is not a de Polignac number, because 25917278931 - 2⁹ = 25917278419 is a prime.

It is a super-2 number, since 2×25917278931² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25917278911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33484470 + ... + 33485243.

It is an arithmetic number, because the mean of its divisors is an integer number (3192223034).

Almost surely, 2^25917278931 is an apocalyptic number.

25917278931 is a deficient number, since it is larger than the sum of its proper divisors (12389397477).

25917278931 is a wasteful number, since it uses less digits than its factorization.

25917278931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66969762 (or 66969759 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 25917278931 in words is "twenty-five billion, nine hundred seventeen million, two hundred seventy-eight thousand, nine hundred thirty-one".