25817409492 has 36 divisors (see below), whose sum is σ = 70075827360. Its totient is φ = 7376402544.

The previous prime is 25817409487. The next prime is 25817409547. The reversal of 25817409492 is 29490471852.

It is a super-2 number, since 2×25817409492² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21952992 + ... + 21954167.

It is an arithmetic number, because the mean of its divisors is an integer number (1946550760).

Almost surely, 2^25817409492 is an apocalyptic number.

It is an amenable number.

25817409492 is an abundant number, since it is smaller than the sum of its proper divisors (44258417868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25817409492 is a wasteful number, since it uses less digits than its factorization.

25817409492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43907180 (or 43907171 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 25817409492 in words is "twenty-five billion, eight hundred seventeen million, four hundred nine thousand, four hundred ninety-two".