166919726947 has 2 divisors, whose sum is σ = 166919726948. Its totient is φ = 166919726946.

The previous prime is 166919726921. The next prime is 166919726969. The reversal of 166919726947 is 749627919661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166919726947 is a prime.

It is a super-2 number, since 2×166919726947² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166919726147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83459863473 + 83459863474.

It is an arithmetic number, because the mean of its divisors is an integer number (83459863474).

Almost surely, 2^166919726947 is an apocalyptic number.

166919726947 is a deficient number, since it is larger than the sum of its proper divisors (1).

166919726947 is an equidigital number, since it uses as much as digits as its factorization.

166919726947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61725888, while the sum is 67.

The spelling of 166919726947 in words is "one hundred sixty-six billion, nine hundred nineteen million, seven hundred twenty-six thousand, nine hundred forty-seven".