216685697744445 has 32 divisors (see below), whose sum is σ = 347279676780672. Its totient is φ = 115371665755392.

The previous prime is 216685697744393. The next prime is 216685697744471. The reversal of 216685697744445 is 544447796586612.

It is not a de Polignac number, because 216685697744445 - 2¹⁴ = 216685697728061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18982279 + ... + 28172651.

It is an arithmetic number, because the mean of its divisors is an integer number (10852489899396).

Almost surely, 2^{216685697744445} is an apocalyptic number.

It is an amenable number.

216685697744445 is a deficient number, since it is larger than the sum of its proper divisors (130593979036227).

216685697744445 is a wasteful number, since it uses less digits than its factorization.

216685697744445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9193021.

The product of its digits is 9754214400, while the sum is 78.

The spelling of 216685697744445 in words is "two hundred sixteen trillion, six hundred eighty-five billion, six hundred ninety-seven million, seven hundred forty-four thousand, four hundred forty-five".