216736556 has 6 divisors (see below), whose sum is σ = 379288980. Its totient is φ = 108368276.

The previous prime is 216736523. The next prime is 216736561. The reversal of 216736556 is 655637612.

216736556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216736556² = 93949469413482272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27092066 + ... + 27092073.

It is an arithmetic number, because the mean of its divisors is an integer number (63214830).

Almost surely, 2^216736556 is an apocalyptic number.

It is an amenable number.

216736556 is a deficient number, since it is larger than the sum of its proper divisors (162552424).

216736556 is a wasteful number, since it uses less digits than its factorization.

216736556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54184143 (or 54184141 counting only the distinct ones).

The product of its digits is 226800, while the sum is 41.

The square root of 216736556 is about 14721.9752750777. The cubic root of 216736556 is about 600.6812225633.

The spelling of 216736556 in words is "two hundred sixteen million, seven hundred thirty-six thousand, five hundred fifty-six".