166377412891 has 2 divisors, whose sum is σ = 166377412892. Its totient is φ = 166377412890.

The previous prime is 166377412769. The next prime is 166377412933. The reversal of 166377412891 is 198214773661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166377412891 - 2⁷ = 166377412763 is a prime.

It is not a weakly prime, because it can be changed into another prime (166377412291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83188706445 + 83188706446.

It is an arithmetic number, because the mean of its divisors is an integer number (83188706446).

Almost surely, 2^166377412891 is an apocalyptic number.

166377412891 is a deficient number, since it is larger than the sum of its proper divisors (1).

166377412891 is an equidigital number, since it uses as much as digits as its factorization.

166377412891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The spelling of 166377412891 in words is "one hundred sixty-six billion, three hundred seventy-seven million, four hundred twelve thousand, eight hundred ninety-one".