216466625 has 8 divisors (see below), whose sum is σ = 270150504. Its totient is φ = 173173200.

The previous prime is 216466609. The next prime is 216466633. The reversal of 216466625 is 526664612.

It can be written as a sum of positive squares in 4 ways, for example, as 494209 + 215972416 = 703^2 + 14696^2 .

It is not a de Polignac number, because 216466625 - 2⁴ = 216466609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865742 + ... + 865991.

It is an arithmetic number, because the mean of its divisors is an integer number (33768813).

Almost surely, 2^216466625 is an apocalyptic number.

216466625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216466625 is a deficient number, since it is larger than the sum of its proper divisors (53683879).

216466625 is an equidigital number, since it uses as much as digits as its factorization.

216466625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731748 (or 1731738 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The square root of 216466625 is about 14712.8047971826. The cubic root of 216466625 is about 600.4317494314.

It can be divided in two parts, 21 and 6466625, that added together give a palindrome (6466646).

The spelling of 216466625 in words is "two hundred sixteen million, four hundred sixty-six thousand, six hundred twenty-five".