161861679 has 16 divisors (see below), whose sum is σ = 274051840. Its totient is φ = 92492280.

The previous prime is 161861671. The next prime is 161861681. The reversal of 161861679 is 976168161.

161861679 is a `hidden beast` number, since 16 + 18 + 616 + 7 + 9 = 666.

161861679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161861679 - 2³ = 161861671 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 (161861671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 428017 + ... + 428394.

It is an arithmetic number, because the mean of its divisors is an integer number (17128240).

Almost surely, 2^161861679 is an apocalyptic number.

161861679 is a deficient number, since it is larger than the sum of its proper divisors (112190161).

161861679 is an equidigital number, since it uses as much as digits as its factorization.

161861679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856427 (or 856421 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 161861679 is about 12722.4871389206. The cubic root of 161861679 is about 544.9809818575.

The spelling of 161861679 in words is "one hundred sixty-one million, eight hundred sixty-one thousand, six hundred seventy-nine".