216396725 has 6 divisors (see below), whose sum is σ = 268331970. Its totient is φ = 173117360.

The previous prime is 216396701. The next prime is 216396727. The reversal of 216396725 is 527693612.

It can be written as a sum of positive squares in 3 ways, for example, as 67141636 + 149255089 = 8194^2 + 12217^2 .

It is not a de Polignac number, because 216396725 - 2¹⁰ = 216395701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216396727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4327910 + ... + 4327959.

It is an arithmetic number, because the mean of its divisors is an integer number (44721995).

Almost surely, 2^216396725 is an apocalyptic number.

216396725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216396725 is a deficient number, since it is larger than the sum of its proper divisors (51935245).

216396725 is an equidigital number, since it uses as much as digits as its factorization.

216396725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8655879 (or 8655874 counting only the distinct ones).

The product of its digits is 136080, while the sum is 41.

The square root of 216396725 is about 14710.4291235844. The cubic root of 216396725 is about 600.3671132969.

The spelling of 216396725 in words is "two hundred sixteen million, three hundred ninety-six thousand, seven hundred twenty-five".