166115051661 has 8 divisors (see below), whose sum is σ = 238524176800. Its totient is φ = 102224647152.

The previous prime is 166115051639. The next prime is 166115051671. The reversal of 166115051661 is 166150511661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166115051661 - 2⁵ = 166115051629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4259360299 = 166115051661 / (1 + 6 + 6 + 1 + 1 + 5 + 0 + 5 + 1 + 6 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166115051671) 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, 2129680111 + ... + 2129680188.

It is an arithmetic number, because the mean of its divisors is an integer number (29815522100).

Almost surely, 2^166115051661 is an apocalyptic number.

It is an amenable number.

166115051661 is a deficient number, since it is larger than the sum of its proper divisors (72409125139).

166115051661 is a wasteful number, since it uses less digits than its factorization.

166115051661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259360315.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 166115051661 in words is "one hundred sixty-six billion, one hundred fifteen million, fifty-one thousand, six hundred sixty-one".