25442532464 has 40 divisors (see below), whose sum is σ = 51934414080. Its totient is φ = 12041265600.

The previous prime is 25442532463. The next prime is 25442532491. The reversal of 25442532464 is 46423524452.

It is a super-2 number, since 2×25442532464² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25442532463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320249 + ... + 391719.

It is an arithmetic number, because the mean of its divisors is an integer number (1298360352).

Almost surely, 2^25442532464 is an apocalyptic number.

It is an amenable number.

25442532464 is an abundant number, since it is smaller than the sum of its proper divisors (26491881616).

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

25442532464 is a wasteful number, since it uses less digits than its factorization.

25442532464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72669 (or 72663 counting only the distinct ones).

The product of its digits is 921600, while the sum is 41.

The spelling of 25442532464 in words is "twenty-five billion, four hundred forty-two million, five hundred thirty-two thousand, four hundred sixty-four".