161995877 has 4 divisors (see below), whose sum is σ = 169039200. Its totient is φ = 154952556.

The previous prime is 161995871. The next prime is 161995903. The reversal of 161995877 is 778599161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161995877 - 2²² = 157801573 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 (161995871) 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, 3521627 + ... + 3521672.

It is an arithmetic number, because the mean of its divisors is an integer number (42259800).

Almost surely, 2^161995877 is an apocalyptic number.

It is an amenable number.

161995877 is a deficient number, since it is larger than the sum of its proper divisors (7043323).

161995877 is an equidigital number, since it uses as much as digits as its factorization.

161995877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043322.

The product of its digits is 952560, while the sum is 53.

The square root of 161995877 is about 12727.7600935907. The cubic root of 161995877 is about 545.1315531263.

The spelling of 161995877 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, eight hundred seventy-seven".