165790819 has 2 divisors, whose sum is σ = 165790820. Its totient is φ = 165790818.

The previous prime is 165790787. The next prime is 165790841. The reversal of 165790819 is 918097561.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (918097561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165790819 - 2⁵ = 165790787 is a prime.

It is a super-2 number, since 2×165790819² = 54973191329381522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165790319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82895409 + 82895410.

It is an arithmetic number, because the mean of its divisors is an integer number (82895410).

Almost surely, 2^165790819 is an apocalyptic number.

165790819 is a deficient number, since it is larger than the sum of its proper divisors (1).

165790819 is an equidigital number, since it uses as much as digits as its factorization.

165790819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 165790819 is about 12875.9783705938. The cubic root of 165790819 is about 549.3555194840.

The spelling of 165790819 in words is "one hundred sixty-five million, seven hundred ninety thousand, eight hundred nineteen".