161676923799 has 4 divisors (see below), whose sum is σ = 215569231736. Its totient is φ = 107784615864.

The previous prime is 161676923731. The next prime is 161676923893. The reversal of 161676923799 is 997329676161.

It is a happy number.

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

It is not a de Polignac number, because 161676923799 - 2²⁰ = 161675875223 is a prime.

It is a super-2 number, since 2×161676923799² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161676923729) 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, 26946153964 + ... + 26946153969.

It is an arithmetic number, because the mean of its divisors is an integer number (53892307934).

Almost surely, 2^161676923799 is an apocalyptic number.

161676923799 is a deficient number, since it is larger than the sum of its proper divisors (53892307937).

161676923799 is an equidigital number, since it uses as much as digits as its factorization.

161676923799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53892307936.

The product of its digits is 46294416, while the sum is 66.

The spelling of 161676923799 in words is "one hundred sixty-one billion, six hundred seventy-six million, nine hundred twenty-three thousand, seven hundred ninety-nine".