165130303021 has 2 divisors, whose sum is σ = 165130303022. Its totient is φ = 165130303020.

The previous prime is 165130302959. The next prime is 165130303033. The reversal of 165130303021 is 120303031561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111148892100 + 53981410921 = 333390^2 + 232339^2 .

It is an emirp because it is prime and its reverse (120303031561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165130303021 - 2⁹ = 165130302509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165130304021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82565151510 + 82565151511.

It is an arithmetic number, because the mean of its divisors is an integer number (82565151511).

Almost surely, 2^165130303021 is an apocalyptic number.

It is an amenable number.

165130303021 is a deficient number, since it is larger than the sum of its proper divisors (1).

165130303021 is an equidigital number, since it uses as much as digits as its factorization.

165130303021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 165130303021 its reverse (120303031561), we get a palindrome (285433334582).

The spelling of 165130303021 in words is "one hundred sixty-five billion, one hundred thirty million, three hundred three thousand, twenty-one".