166516515197 has 2 divisors, whose sum is σ = 166516515198. Its totient is φ = 166516515196.

The previous prime is 166516515133. The next prime is 166516515239. The reversal of 166516515197 is 791515615661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155408619961 + 11107895236 = 394219^2 + 105394^2 .

It is a cyclic number.

It is not a de Polignac number, because 166516515197 - 2⁶ = 166516515133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166516545197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258257598 + 83258257599.

It is an arithmetic number, because the mean of its divisors is an integer number (83258257599).

Almost surely, 2^166516515197 is an apocalyptic number.

It is an amenable number.

166516515197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166516515197 is an equidigital number, since it uses as much as digits as its factorization.

166516515197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 53.

The spelling of 166516515197 in words is "one hundred sixty-six billion, five hundred sixteen million, five hundred fifteen thousand, one hundred ninety-seven".