163537506917 has 4 divisors (see below), whose sum is σ = 163540826316. Its totient is φ = 163534187520.

The previous prime is 163537506911. The next prime is 163537506941. The reversal of 163537506917 is 719605735361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74593988161 + 88943518756 = 273119^2 + 298234^2 .

It is a cyclic number.

It is not a de Polignac number, because 163537506917 - 2³⁴ = 146357637733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163537506911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1584668 + ... + 1684709.

It is an arithmetic number, because the mean of its divisors is an integer number (40885206579).

Almost surely, 2^163537506917 is an apocalyptic number.

It is an amenable number.

163537506917 is a deficient number, since it is larger than the sum of its proper divisors (3319399).

163537506917 is an equidigital number, since it uses as much as digits as its factorization.

163537506917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319398.

The product of its (nonzero) digits is 3572100, while the sum is 53.

The spelling of 163537506917 in words is "one hundred sixty-three billion, five hundred thirty-seven million, five hundred six thousand, nine hundred seventeen".