216686881063906 has 32 divisors (see below), whose sum is σ = 373258989633600. Its totient is φ = 93305532934080.

The previous prime is 216686881063883. The next prime is 216686881063949. The reversal of 216686881063906 is 609360188686612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4315305 + ... + 21260188.

It is an arithmetic number, because the mean of its divisors is an integer number (11664343426050).

Almost surely, 2^{216686881063906} is an apocalyptic number.

216686881063906 is a deficient number, since it is larger than the sum of its proper divisors (156572108569694).

216686881063906 is a wasteful number, since it uses less digits than its factorization.

216686881063906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25595794.

The product of its (nonzero) digits is 214990848, while the sum is 70.

The spelling of 216686881063906 in words is "two hundred sixteen trillion, six hundred eighty-six billion, eight hundred eighty-one million, sixty-three thousand, nine hundred six".