216690886686550 has 48 divisors (see below), whose sum is σ = 403448109498720. Its totient is φ = 86589680451840.

The previous prime is 216690886686541. The next prime is 216690886686551. The reversal of 216690886686550 is 55686688096612.

216690886686550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216690886686551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571559719 + ... + 2571643981.

It is an arithmetic number, because the mean of its divisors is an integer number (8405168947890).

Almost surely, 2^{216690886686550} is an apocalyptic number.

216690886686550 is a deficient number, since it is larger than the sum of its proper divisors (186757222812170).

216690886686550 is a wasteful number, since it uses less digits than its factorization.

216690886686550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135097 (or 135092 counting only the distinct ones).

The product of its (nonzero) digits is 1791590400, while the sum is 76.

The spelling of 216690886686550 in words is "two hundred sixteen trillion, six hundred ninety billion, eight hundred eighty-six million, six hundred eighty-six thousand, five hundred fifty".