25409635216 has 45 divisors (see below), whose sum is σ = 57278971281. Its totient is φ = 10887930816.

The previous prime is 25409635133. The next prime is 25409635219. The reversal of 25409635216 is 61253690452.

The square root of 25409635216 is 159404.

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., 3120339600 + 22289295616 = 55860^2 + 149296^2 .

It is not an unprimeable number, because it can be changed into a prime (25409635219) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4460466 + ... + 4466158.

Almost surely, 2^25409635216 is an apocalyptic number.

25409635216 is the 159404-th square number.

It is an amenable number.

25409635216 is an abundant number, since it is smaller than the sum of its proper divisors (31869336065).

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

25409635216 is an frugal number, since it uses more digits than its factorization.

25409635216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 25409635216 in words is "twenty-five billion, four hundred nine million, six hundred thirty-five thousand, two hundred sixteen".