166906565747 has 2 divisors, whose sum is σ = 166906565748. Its totient is φ = 166906565746.

The previous prime is 166906565689. The next prime is 166906565789. The reversal of 166906565747 is 747565609661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166906565747 - 2¹² = 166906561651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166906565747.

It is not a weakly prime, because it can be changed into another prime (166906565447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83453282873 + 83453282874.

It is an arithmetic number, because the mean of its divisors is an integer number (83453282874).

Almost surely, 2^166906565747 is an apocalyptic number.

166906565747 is a deficient number, since it is larger than the sum of its proper divisors (1).

166906565747 is an equidigital number, since it uses as much as digits as its factorization.

166906565747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57153600, while the sum is 62.

The spelling of 166906565747 in words is "one hundred sixty-six billion, nine hundred six million, five hundred sixty-five thousand, seven hundred forty-seven".