216620320043656 has 8 divisors (see below), whose sum is σ = 406163100081870. Its totient is φ = 108310160021824.

The previous prime is 216620320043627. The next prime is 216620320043747. The reversal of 216620320043656 is 656340023026612.

It can be written as a sum of positive squares in only one way, i.e., 205849780621156 + 10770539422500 = 14347466^2 + 3281850^2 .

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, 13538770002721 + ... + 13538770002736.

Almost surely, 2^{216620320043656} is an apocalyptic number.

It is an amenable number.

216620320043656 is a deficient number, since it is larger than the sum of its proper divisors (189542780038214).

216620320043656 is a wasteful number, since it uses less digits than its factorization.

216620320043656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27077540005463 (or 27077540005459 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 46.

The spelling of 216620320043656 in words is "two hundred sixteen trillion, six hundred twenty billion, three hundred twenty million, forty-three thousand, six hundred fifty-six".