161503713671 has 4 divisors (see below), whose sum is σ = 161700430344. Its totient is φ = 161306997000.

The previous prime is 161503713653. The next prime is 161503713737. The reversal of 161503713671 is 176317305161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176317305161 = 408209 ⋅431929.

It is a cyclic number.

It is not a de Polignac number, because 161503713671 - 2³⁰ = 160429971847 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 (161503713601) 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, 98357105 + ... + 98358746.

It is an arithmetic number, because the mean of its divisors is an integer number (40425107586).

Almost surely, 2^161503713671 is an apocalyptic number.

161503713671 is a deficient number, since it is larger than the sum of its proper divisors (196716673).

161503713671 is an equidigital number, since it uses as much as digits as its factorization.

161503713671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196716672.

The product of its (nonzero) digits is 79380, while the sum is 41.

The spelling of 161503713671 in words is "one hundred sixty-one billion, five hundred three million, seven hundred thirteen thousand, six hundred seventy-one".