165120735553 has 2 divisors, whose sum is σ = 165120735554. Its totient is φ = 165120735552.

The previous prime is 165120735541. The next prime is 165120735557. The reversal of 165120735553 is 355537021561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114804413584 + 50316321969 = 338828^2 + 224313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165120735553 is a prime.

It is not a weakly prime, because it can be changed into another prime (165120735557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82560367776 + 82560367777.

It is an arithmetic number, because the mean of its divisors is an integer number (82560367777).

Almost surely, 2^165120735553 is an apocalyptic number.

It is an amenable number.

165120735553 is a deficient number, since it is larger than the sum of its proper divisors (1).

165120735553 is an equidigital number, since it uses as much as digits as its factorization.

165120735553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472500, while the sum is 43.

The spelling of 165120735553 in words is "one hundred sixty-five billion, one hundred twenty million, seven hundred thirty-five thousand, five hundred fifty-three".