166681818334 has 4 divisors (see below), whose sum is σ = 250022727504. Its totient is φ = 83340909166.

The previous prime is 166681818313. The next prime is 166681818341. The reversal of 166681818334 is 433818186661.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41670454582 + ... + 41670454585.

It is an arithmetic number, because the mean of its divisors is an integer number (62505681876).

Almost surely, 2^166681818334 is an apocalyptic number.

166681818334 is a deficient number, since it is larger than the sum of its proper divisors (83340909170).

166681818334 is an equidigital number, since it uses as much as digits as its factorization.

166681818334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83340909169.

The product of its digits is 3981312, while the sum is 55.

The spelling of 166681818334 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, three hundred thirty-four".