161983137517 has 8 divisors (see below), whose sum is σ = 163819998720. Its totient is φ = 160146650400.

The previous prime is 161983137457. The next prime is 161983137521. The reversal of 161983137517 is 715731389161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161983137517 - 2³⁵ = 127623399149 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 (161983137527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828642 + ... + 1005292.

It is an arithmetic number, because the mean of its divisors is an integer number (20477499840).

Almost surely, 2^161983137517 is an apocalyptic number.

It is an amenable number.

161983137517 is a deficient number, since it is larger than the sum of its proper divisors (1836861203).

161983137517 is a wasteful number, since it uses less digits than its factorization.

161983137517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187043.

The product of its digits is 952560, while the sum is 52.

The spelling of 161983137517 in words is "one hundred sixty-one billion, nine hundred eighty-three million, one hundred thirty-seven thousand, five hundred seventeen".