16539246025 has 45 divisors (see below), whose sum is σ = 22038028681. Its totient is φ = 12313157120.

The previous prime is 16539246007. The next prime is 16539246037. The reversal of 16539246025 is 52064293561.

The square root of 16539246025 is 128605.

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

It can be written as a sum of positive squares in 22 ways, for example, as 16313164729 + 226081296 = 127723^2 + 15036^2 .

It is not a de Polignac number, because 16539246025 - 2¹³ = 16539237833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 185834181 + ... + 185834269.

Almost surely, 2^16539246025 is an apocalyptic number.

16539246025 is the 128605-th square number.

16539246025 is the 64303-rd centered octagonal number.

It is an amenable number.

16539246025 is a deficient number, since it is larger than the sum of its proper divisors (5498782656).

16539246025 is an frugal number, since it uses more digits than its factorization.

16539246025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 111 counting only the distinct ones).

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

The spelling of 16539246025 in words is "sixteen billion, five hundred thirty-nine million, two hundred forty-six thousand, twenty-five".