25492021988 has 6 divisors (see below), whose sum is σ = 44611038486. Its totient is φ = 12746010992.

The previous prime is 25492021981. The next prime is 25492021993. The reversal of 25492021988 is 88912029452.

It can be written as a sum of positive squares in only one way, i.e., 14668116544 + 10823905444 = 121112^2 + 104038^2 .

It is not an unprimeable number, because it can be changed into a prime (25492021981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3186502745 + ... + 3186502752.

It is an arithmetic number, because the mean of its divisors is an integer number (7435173081).

Almost surely, 2^25492021988 is an apocalyptic number.

It is an amenable number.

25492021988 is a deficient number, since it is larger than the sum of its proper divisors (19119016498).

25492021988 is a wasteful number, since it uses less digits than its factorization.

25492021988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6373005501 (or 6373005499 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 25492021988 in words is "twenty-five billion, four hundred ninety-two million, twenty-one thousand, nine hundred eighty-eight".