25878505016464 has 45 divisors (see below), whose sum is σ = 51230994724147. Its totient is φ = 12663481250912.

The previous prime is 25878505016381. The next prime is 25878505016471. The reversal of 25878505016464 is 46461050587852.

The square root of 25878505016464 is 5087092.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×25878505016464² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 956359767 + ... + 956386825.

Almost surely, 2^{25878505016464} is an apocalyptic number.

25878505016464 is the 5087092-nd square number.

It is an amenable number.

25878505016464 is a deficient number, since it is larger than the sum of its proper divisors (25352489707683).

25878505016464 is an frugal number, since it uses more digits than its factorization.

25878505016464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54220 (or 27108 counting only the distinct ones).

The product of its (nonzero) digits is 64512000, while the sum is 61.

The spelling of 25878505016464 in words is "twenty-five trillion, eight hundred seventy-eight billion, five hundred five million, sixteen thousand, four hundred sixty-four".