216531302191885 has 16 divisors (see below), whose sum is σ = 260418018646656. Its totient is φ = 172838139622848.

The previous prime is 216531302191873. The next prime is 216531302191909. The reversal of 216531302191885 is 588191203135612.

It is a cyclic number.

It is not a de Polignac number, because 216531302191885 - 2¹⁷ = 216531302060813 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 21025864 + ... + 29582926.

It is an arithmetic number, because the mean of its divisors is an integer number (16276126165416).

Almost surely, 2^{216531302191885} is an apocalyptic number.

It is an amenable number.

216531302191885 is a deficient number, since it is larger than the sum of its proper divisors (43886716454771).

216531302191885 is a wasteful number, since it uses less digits than its factorization.

216531302191885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568372.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 216531302191885 in words is "two hundred sixteen trillion, five hundred thirty-one billion, three hundred two million, one hundred ninety-one thousand, eight hundred eighty-five".