216349637956 has 9 divisors (see below), whose sum is σ = 378613494399. Its totient is φ = 108174353844.

The previous prime is 216349637941. The next prime is 216349637963. The reversal of 216349637956 is 659736943612.

It is a happy number.

The square root of 216349637956 is 465134.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216349637894 and 216349637903.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 813985 + ... + 1046551.

Almost surely, 2^216349637956 is an apocalyptic number.

216349637956 is the 465134-th square number.

It is an amenable number.

216349637956 is a deficient number, since it is larger than the sum of its proper divisors (162263856443).

216349637956 is an frugal number, since it uses more digits than its factorization.

216349637956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465138 (or 232569 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 61.

The spelling of 216349637956 in words is "two hundred sixteen billion, three hundred forty-nine million, six hundred thirty-seven thousand, nine hundred fifty-six".