25749778931776 has 63 divisors (see below), whose sum is σ = 51685046468029. Its totient is φ = 12728441589248.

The previous prime is 25749778931741. The next prime is 25749778931857. The reversal of 25749778931776 is 67713987794752.

The square root of 25749778931776 is 5074424.

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

It can be written as a sum of positive squares in only one way, i.e., 4944503693376 + 20805275238400 = 2223624^2 + 4561280^2 .

It is a super-2 number, since 2×25749778931776² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25749778931776.

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, 3612986325 + ... + 3612993451.

Almost surely, 2^{25749778931776} is an apocalyptic number.

25749778931776 is the 5074424-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25749778931776

25749778931776 is an abundant number, since it is smaller than the sum of its proper divisors (25935267536253).

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

25749778931776 is an frugal number, since it uses more digits than its factorization.

25749778931776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14444 (or 7218 counting only the distinct ones).

The product of its digits is 7841473920, while the sum is 82.

The spelling of 25749778931776 in words is "twenty-five trillion, seven hundred forty-nine billion, seven hundred seventy-eight million, nine hundred thirty-one thousand, seven hundred seventy-six".