216542625 has 64 divisors (see below), whose sum is σ = 397453056. Its totient is φ = 104025600.

The previous prime is 216542609. The next prime is 216542633. The reversal of 216542625 is 526245612.

It is not a de Polignac number, because 216542625 - 2⁴ = 216542609 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209109 + ... + 210141.

It is an arithmetic number, because the mean of its divisors is an integer number (6210204).

Almost surely, 2^216542625 is an apocalyptic number.

216542625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216542625 is a deficient number, since it is larger than the sum of its proper divisors (180910431).

216542625 is a wasteful number, since it uses less digits than its factorization.

216542625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1097 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 216542625 is about 14715.3873547386. The cubic root of 216542625 is about 600.5020104143.

The spelling of 216542625 in words is "two hundred sixteen million, five hundred forty-two thousand, six hundred twenty-five".