166681818331 has 8 divisors (see below), whose sum is σ = 201699007200. Its totient is φ = 134466004608.

The previous prime is 166681818313. The next prime is 166681818341. The reversal of 166681818331 is 133818186661.

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 166681818331 - 2⁵ = 166681818299 is a prime.

It is a super-2 number, since 2×166681818331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166681818341) 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, 700343656 + ... + 700343893.

It is an arithmetic number, because the mean of its divisors is an integer number (25212375900).

Almost surely, 2^166681818331 is an apocalyptic number.

166681818331 is a deficient number, since it is larger than the sum of its proper divisors (35017188869).

166681818331 is a wasteful number, since it uses less digits than its factorization.

166681818331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400687573.

The product of its digits is 995328, while the sum is 52.

The spelling of 166681818331 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, three hundred thirty-one".