166489933747 has 2 divisors, whose sum is σ = 166489933748. Its totient is φ = 166489933746.

The previous prime is 166489933711. The next prime is 166489933777. The reversal of 166489933747 is 747339984661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166489933747 is a prime.

It is not a weakly prime, because it can be changed into another prime (166489933777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83244966873 + 83244966874.

It is an arithmetic number, because the mean of its divisors is an integer number (83244966874).

Almost surely, 2^166489933747 is an apocalyptic number.

166489933747 is a deficient number, since it is larger than the sum of its proper divisors (1).

166489933747 is an equidigital number, since it uses as much as digits as its factorization.

166489933747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164602368, while the sum is 67.

The spelling of 166489933747 in words is "one hundred sixty-six billion, four hundred eighty-nine million, nine hundred thirty-three thousand, seven hundred forty-seven".