165315331501 has 2 divisors, whose sum is σ = 165315331502. Its totient is φ = 165315331500.

The previous prime is 165315331483. The next prime is 165315331529. The reversal of 165315331501 is 105133513561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94931772100 + 70383559401 = 308110^2 + 265299^2 .

It is a cyclic number.

It is not a de Polignac number, because 165315331501 - 2¹⁷ = 165315200429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165315331541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82657665750 + 82657665751.

It is an arithmetic number, because the mean of its divisors is an integer number (82657665751).

Almost surely, 2^165315331501 is an apocalyptic number.

It is an amenable number.

165315331501 is a deficient number, since it is larger than the sum of its proper divisors (1).

165315331501 is an equidigital number, since it uses as much as digits as its factorization.

165315331501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 34.

The spelling of 165315331501 in words is "one hundred sixty-five billion, three hundred fifteen million, three hundred thirty-one thousand, five hundred one".