166104193961 has 2 divisors, whose sum is σ = 166104193962. Its totient is φ = 166104193960.

The previous prime is 166104193951. The next prime is 166104193973. The reversal of 166104193961 is 169391401661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163584655936 + 2519538025 = 404456^2 + 50195^2 .

It is a cyclic number.

It is not a de Polignac number, because 166104193961 - 2⁶ = 166104193897 is a prime.

It is not a weakly prime, because it can be changed into another prime (166104193951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83052096980 + 83052096981.

It is an arithmetic number, because the mean of its divisors is an integer number (83052096981).

Almost surely, 2^166104193961 is an apocalyptic number.

It is an amenable number.

166104193961 is a deficient number, since it is larger than the sum of its proper divisors (1).

166104193961 is an equidigital number, since it uses as much as digits as its factorization.

166104193961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 166104193961 in words is "one hundred sixty-six billion, one hundred four million, one hundred ninety-three thousand, nine hundred sixty-one".