165059775997 has 2 divisors, whose sum is σ = 165059775998. Its totient is φ = 165059775996.

The previous prime is 165059775983. The next prime is 165059776001. The reversal of 165059775997 is 799577950561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141025785156 + 24033990841 = 375534^2 + 155029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165059775997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165029775997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82529887998 + 82529887999.

It is an arithmetic number, because the mean of its divisors is an integer number (82529887999).

Almost surely, 2^165059775997 is an apocalyptic number.

It is an amenable number.

165059775997 is a deficient number, since it is larger than the sum of its proper divisors (1).

165059775997 is an equidigital number, since it uses as much as digits as its factorization.

165059775997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 187535250, while the sum is 70.

The spelling of 165059775997 in words is "one hundred sixty-five billion, fifty-nine million, seven hundred seventy-five thousand, nine hundred ninety-seven".