166877947 has 2 divisors, whose sum is σ = 166877948. Its totient is φ = 166877946.

The previous prime is 166877917. The next prime is 166877981. The reversal of 166877947 is 749778661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166877947 - 2¹⁹ = 166353659 is a prime.

It is not a weakly prime, because it can be changed into another prime (166877917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83438973 + 83438974.

It is an arithmetic number, because the mean of its divisors is an integer number (83438974).

Almost surely, 2^166877947 is an apocalyptic number.

166877947 is a deficient number, since it is larger than the sum of its proper divisors (1).

166877947 is an equidigital number, since it uses as much as digits as its factorization.

166877947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 55.

The square root of 166877947 is about 12918.1247478107. The cubic root of 166877947 is about 550.5536540509.

The spelling of 166877947 in words is "one hundred sixty-six million, eight hundred seventy-seven thousand, nine hundred forty-seven".