166657781323 has 8 divisors (see below), whose sum is σ = 181814308416. Its totient is φ = 151502224200.

The previous prime is 166657781309. The next prime is 166657781347. The reversal of 166657781323 is 323187756661.

It is a happy number.

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 166657781323 - 2⁹ = 166657780811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166657781383) 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, 143488 + ... + 594898.

It is an arithmetic number, because the mean of its divisors is an integer number (22726788552).

Almost surely, 2^166657781323 is an apocalyptic number.

166657781323 is a deficient number, since it is larger than the sum of its proper divisors (15156527093).

166657781323 is a wasteful number, since it uses less digits than its factorization.

166657781323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484985.

The product of its digits is 7620480, while the sum is 55.

The spelling of 166657781323 in words is "one hundred sixty-six billion, six hundred fifty-seven million, seven hundred eighty-one thousand, three hundred twenty-three".