216866138883 has 16 divisors (see below), whose sum is σ = 306259245216. Its totient is φ = 136030522880.

The previous prime is 216866138843. The next prime is 216866138893. The reversal of 216866138883 is 388831668612.

It is a cyclic number.

It is not a de Polignac number, because 216866138883 - 2¹² = 216866134787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216866138843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495816 + ... + 824357.

It is an arithmetic number, because the mean of its divisors is an integer number (19141202826).

Almost surely, 2^216866138883 is an apocalyptic number.

216866138883 is a deficient number, since it is larger than the sum of its proper divisors (89393106333).

216866138883 is a wasteful number, since it uses less digits than its factorization.

216866138883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323414.

The product of its digits is 15925248, while the sum is 60.

The spelling of 216866138883 in words is "two hundred sixteen billion, eight hundred sixty-six million, one hundred thirty-eight thousand, eight hundred eighty-three".