161379316561 has 8 divisors (see below), whose sum is σ = 163515457280. Its totient is φ = 159245510112.

The previous prime is 161379316499. The next prime is 161379316577. The reversal of 161379316561 is 165613973161.

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 161379316561 - 2³⁷ = 23940363089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161379326561) 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, 444165 + ... + 721138.

It is an arithmetic number, because the mean of its divisors is an integer number (20439432160).

Almost surely, 2^161379316561 is an apocalyptic number.

It is an amenable number.

161379316561 is a deficient number, since it is larger than the sum of its proper divisors (2136140719).

161379316561 is a wasteful number, since it uses less digits than its factorization.

161379316561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167135.

The product of its digits is 612360, while the sum is 49.

The spelling of 161379316561 in words is "one hundred sixty-one billion, three hundred seventy-nine million, three hundred sixteen thousand, five hundred sixty-one".