216531256444205 has 16 divisors (see below), whose sum is σ = 260291159498304. Its totient is φ = 172922822793600.

The previous prime is 216531256444163. The next prime is 216531256444249. The reversal of 216531256444205 is 502444652135612.

It is not a de Polignac number, because 216531256444205 - 2⁶ = 216531256444141 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, 8887592 + ... + 22628561.

It is an arithmetic number, because the mean of its divisors is an integer number (16268197468644).

Almost surely, 2^{216531256444205} is an apocalyptic number.

It is an amenable number.

216531256444205 is a deficient number, since it is larger than the sum of its proper divisors (43759903054099).

216531256444205 is a wasteful number, since it uses less digits than its factorization.

216531256444205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31518556.

The product of its (nonzero) digits is 6912000, while the sum is 50.

The spelling of 216531256444205 in words is "two hundred sixteen trillion, five hundred thirty-one billion, two hundred fifty-six million, four hundred forty-four thousand, two hundred five".