216689550653886 has 32 divisors (see below), whose sum is σ = 434367028338048. Its totient is φ = 72065238393120.

The previous prime is 216689550653879. The next prime is 216689550653957. The reversal of 216689550653886 is 688356055986612.

It is a super-2 number, since 2×216689550653886² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14991741 + ... + 25654071.

It is an arithmetic number, because the mean of its divisors is an integer number (13573969635564).

Almost surely, 2^{216689550653886} is an apocalyptic number.

216689550653886 is an abundant number, since it is smaller than the sum of its proper divisors (217677477684162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216689550653886 is a wasteful number, since it uses less digits than its factorization.

216689550653886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10670056.

The product of its (nonzero) digits is 4478976000, while the sum is 78.

The spelling of 216689550653886 in words is "two hundred sixteen trillion, six hundred eighty-nine billion, five hundred fifty million, six hundred fifty-three thousand, eight hundred eighty-six".