165016666691 has 2 divisors, whose sum is σ = 165016666692. Its totient is φ = 165016666690.

The previous prime is 165016666681. The next prime is 165016666697. The reversal of 165016666691 is 196666610561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165016666691 is a prime.

It is not a weakly prime, because it can be changed into another prime (165016666697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82508333345 + 82508333346.

It is an arithmetic number, because the mean of its divisors is an integer number (82508333346).

Almost surely, 2^165016666691 is an apocalyptic number.

165016666691 is a deficient number, since it is larger than the sum of its proper divisors (1).

165016666691 is an equidigital number, since it uses as much as digits as its factorization.

165016666691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 165016666691 in words is "one hundred sixty-five billion, sixteen million, six hundred sixty-six thousand, six hundred ninety-one".