216845137397 has 16 divisors (see below), whose sum is σ = 248668492800. Its totient is φ = 185233644288.

The previous prime is 216845137367. The next prime is 216845137433. The reversal of 216845137397 is 793731548612.

It is not a de Polignac number, because 216845137397 - 2²⁴ = 216828360181 is a prime.

It is a super-2 number, since 2×216845137397² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216845137357) 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, 5640083 + ... + 5678399.

It is an arithmetic number, because the mean of its divisors is an integer number (15541780800).

Almost surely, 2^216845137397 is an apocalyptic number.

It is an amenable number.

216845137397 is a deficient number, since it is larger than the sum of its proper divisors (31823355403).

216845137397 is a wasteful number, since it uses less digits than its factorization.

216845137397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41060.

The product of its digits is 7620480, while the sum is 56.

The spelling of 216845137397 in words is "two hundred sixteen billion, eight hundred forty-five million, one hundred thirty-seven thousand, three hundred ninety-seven".