216909023205 has 16 divisors (see below), whose sum is σ = 396633642624. Its totient is φ = 99158410560.

The previous prime is 216909023203. The next prime is 216909023213. The reversal of 216909023205 is 502320909612.

It is not a de Polignac number, because 216909023205 - 2¹ = 216909023203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216909023203) 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, 1032900006 + ... + 1032900215.

It is an arithmetic number, because the mean of its divisors is an integer number (24789602664).

Almost surely, 2^216909023205 is an apocalyptic number.

It is an amenable number.

216909023205 is a deficient number, since it is larger than the sum of its proper divisors (179724619419).

216909023205 is a wasteful number, since it uses less digits than its factorization.

216909023205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065800236.

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 216909023205 in words is "two hundred sixteen billion, nine hundred nine million, twenty-three thousand, two hundred five".