165976997 has 2 divisors, whose sum is σ = 165976998. Its totient is φ = 165976996.

The previous prime is 165976963. The next prime is 165977017. The reversal of 165976997 is 799679561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155775361 + 10201636 = 12481^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 165976997 - 2¹² = 165972901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165976907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82988498 + 82988499.

It is an arithmetic number, because the mean of its divisors is an integer number (82988499).

Almost surely, 2^165976997 is an apocalyptic number.

It is an amenable number.

165976997 is a deficient number, since it is larger than the sum of its proper divisors (1).

165976997 is an equidigital number, since it uses as much as digits as its factorization.

165976997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6429780, while the sum is 59.

The square root of 165976997 is about 12883.2060062703. The cubic root of 165976997 is about 549.5610790186.

The spelling of 165976997 in words is "one hundred sixty-five million, nine hundred seventy-six thousand, nine hundred ninety-seven".