166640761 has 8 divisors (see below), whose sum is σ = 192132864. Its totient is φ = 141570240.

The previous prime is 166640741. The next prime is 166640797. The reversal of 166640761 is 167046661.

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

It is not a de Polignac number, because 166640761 - 2¹⁷ = 166509689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166640761.

It is not an unprimeable number, because it can be changed into a prime (166640701) 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, 104545 + ... + 106126.

It is an arithmetic number, because the mean of its divisors is an integer number (24016608).

Almost surely, 2^166640761 is an apocalyptic number.

It is an amenable number.

166640761 is a deficient number, since it is larger than the sum of its proper divisors (25492103).

166640761 is a wasteful number, since it uses less digits than its factorization.

166640761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210791.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 166640761 is about 12908.9411262117. The cubic root of 166640761 is about 550.2926937961.

The spelling of 166640761 in words is "one hundred sixty-six million, six hundred forty thousand, seven hundred sixty-one".