2539658816 has 14 divisors (see below), whose sum is σ = 5039635590. Its totient is φ = 1269829376.

The previous prime is 2539658809. The next prime is 2539658843. The reversal of 2539658816 is 6188569352.

It can be written as a sum of positive squares in only one way, i.e., 2390818816 + 148840000 = 48896^2 + 12200^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19841021 + ... + 19841148.

Almost surely, 2^2539658816 is an apocalyptic number.

It is an amenable number.

2539658816 is a deficient number, since it is larger than the sum of its proper divisors (2499976774).

2539658816 is an equidigital number, since it uses as much as digits as its factorization.

2539658816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39682181 (or 39682171 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 53.

The square root of 2539658816 is about 50395.0276912316. The cubic root of 2539658816 is about 1364.3478958831.

The spelling of 2539658816 in words is "two billion, five hundred thirty-nine million, six hundred fifty-eight thousand, eight hundred sixteen".