161066156665 has 8 divisors (see below), whose sum is σ = 193497295680. Its totient is φ = 128707653552.

The previous prime is 161066156623. The next prime is 161066156677. The reversal of 161066156665 is 566651660161.

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 161066156665 - 2²⁵ = 161032602233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18154095 + ... + 18162964.

It is an arithmetic number, because the mean of its divisors is an integer number (24187161960).

Almost surely, 2^161066156665 is an apocalyptic number.

It is an amenable number.

161066156665 is a deficient number, since it is larger than the sum of its proper divisors (32431139015).

161066156665 is an equidigital number, since it uses as much as digits as its factorization.

161066156665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36317951.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 161066156665 in words is "one hundred sixty-one billion, sixty-six million, one hundred fifty-six thousand, six hundred sixty-five".