25864974442 has 16 divisors (see below), whose sum is σ = 39079831752. Its totient is φ = 12838694400.

The previous prime is 25864974397. The next prime is 25864974451. The reversal of 25864974442 is 24447946852.

It can be written as a sum of positive squares in 4 ways, for example, as 22943463841 + 2921510601 = 151471^2 + 54051^2 .

It is a super-2 number, since 2×25864974442² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74692 + ... + 239392.

Almost surely, 2^25864974442 is an apocalyptic number.

25864974442 is a deficient number, since it is larger than the sum of its proper divisors (13214857310).

25864974442 is a wasteful number, since it uses less digits than its factorization.

25864974442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165273.

The product of its digits is 15482880, while the sum is 55.

The spelling of 25864974442 in words is "twenty-five billion, eight hundred sixty-four million, nine hundred seventy-four thousand, four hundred forty-two".