216631144616 has 8 divisors (see below), whose sum is σ = 406183396170. Its totient is φ = 108315572304.

The previous prime is 216631144571. The next prime is 216631144627. The reversal of 216631144616 is 616441136612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 190628292100 + 26002852516 = 436610^2 + 161254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13539446531 + ... + 13539446546.

Almost surely, 2^216631144616 is an apocalyptic number.

It is an amenable number.

216631144616 is a deficient number, since it is larger than the sum of its proper divisors (189552251554).

216631144616 is a wasteful number, since it uses less digits than its factorization.

216631144616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27078893083 (or 27078893079 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The spelling of 216631144616 in words is "two hundred sixteen billion, six hundred thirty-one million, one hundred forty-four thousand, six hundred sixteen".