166219700897 has 2 divisors, whose sum is σ = 166219700898. Its totient is φ = 166219700896.

The previous prime is 166219700861. The next prime is 166219700923. The reversal of 166219700897 is 798007912661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134330313121 + 31889387776 = 366511^2 + 178576^2 .

It is a cyclic number.

It is not a de Polignac number, because 166219700897 - 2¹² = 166219696801 is a prime.

It is not a weakly prime, because it can be changed into another prime (166219700807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83109850448 + 83109850449.

It is an arithmetic number, because the mean of its divisors is an integer number (83109850449).

Almost surely, 2^166219700897 is an apocalyptic number.

It is an amenable number.

166219700897 is a deficient number, since it is larger than the sum of its proper divisors (1).

166219700897 is an equidigital number, since it uses as much as digits as its factorization.

166219700897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 166219700897 in words is "one hundred sixty-six billion, two hundred nineteen million, seven hundred thousand, eight hundred ninety-seven".