165120735557 has 2 divisors, whose sum is σ = 165120735558. Its totient is φ = 165120735556.

The previous prime is 165120735553. The next prime is 165120735583. The reversal of 165120735557 is 755537021561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137511922276 + 27608813281 = 370826^2 + 166159^2 .

It is a cyclic number.

It is not a de Polignac number, because 165120735557 - 2² = 165120735553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165120735553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82560367778 + 82560367779.

It is an arithmetic number, because the mean of its divisors is an integer number (82560367779).

Almost surely, 2^165120735557 is an apocalyptic number.

It is an amenable number.

165120735557 is a deficient number, since it is larger than the sum of its proper divisors (1).

165120735557 is an equidigital number, since it uses as much as digits as its factorization.

165120735557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102500, while the sum is 47.

The spelling of 165120735557 in words is "one hundred sixty-five billion, one hundred twenty million, seven hundred thirty-five thousand, five hundred fifty-seven".