166661036511 has 8 divisors (see below), whose sum is σ = 235286169264. Its totient is φ = 104571630720.

The previous prime is 166661036491. The next prime is 166661036533. The reversal of 166661036511 is 115630166661.

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

It is not a de Polignac number, because 166661036511 - 2⁷ = 166661036383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166661036011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1633931680 + ... + 1633931781.

It is an arithmetic number, because the mean of its divisors is an integer number (29410771158).

Almost surely, 2^166661036511 is an apocalyptic number.

166661036511 is a deficient number, since it is larger than the sum of its proper divisors (68625132753).

166661036511 is a wasteful number, since it uses less digits than its factorization.

166661036511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3267863481.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 166661036511 in words is "one hundred sixty-six billion, six hundred sixty-one million, thirty-six thousand, five hundred eleven".