1566216216 has 64 divisors (see below), whose sum is σ = 4468207200. Its totient is φ = 507959424.

The previous prime is 1566216209. The next prime is 1566216221. The reversal of 1566216216 is 6126126651.

1566216216 is a `hidden beast` number, since 1 + 5 + 6 + 6 + 21 + 621 + 6 = 666.

It is a super-2 number, since 2×1566216216² = 4906066470522717312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 89995 + ... + 105978.

Almost surely, 2^1566216216 is an apocalyptic number.

It is an amenable number.

1566216216 is an abundant number, since it is smaller than the sum of its proper divisors (2901990984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1566216216 is a wasteful number, since it uses less digits than its factorization.

1566216216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196025 (or 196015 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1566216216 is about 39575.4496626381. The cubic root of 1566216216 is about 1161.3164345222.

It can be divided in two parts, 15662 and 16216, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 1566216216 in words is "one billion, five hundred sixty-six million, two hundred sixteen thousand, two hundred sixteen".