16239679225 has 81 divisors (see below), whose sum is σ = 25826063823. Its totient is φ = 10092852000.

The previous prime is 16239679219. The next prime is 16239679243. The reversal of 16239679225 is 52297693261.

The square root of 16239679225 is 127435.

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., 5846284521 + 10393394704 = 76461^2 + 101948^2 .

It is not a de Polignac number, because 16239679225 - 2⁵ = 16239679193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 49062310 + ... + 49062640.

Almost surely, 2^16239679225 is an apocalyptic number.

16239679225 is the 127435-th square number.

16239679225 is the 63718-th centered octagonal number.

It is an amenable number.

16239679225 is a deficient number, since it is larger than the sum of its proper divisors (9586384598).

16239679225 is an equidigital number, since it uses as much as digits as its factorization.

16239679225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 354 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 52.

The spelling of 16239679225 in words is "sixteen billion, two hundred thirty-nine million, six hundred seventy-nine thousand, two hundred twenty-five".