165713647549 has 2 divisors, whose sum is σ = 165713647550. Its totient is φ = 165713647548.

The previous prime is 165713647511. The next prime is 165713647559. The reversal of 165713647549 is 945746317561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162187425625 + 3526221924 = 402725^2 + 59382^2 .

It is a cyclic number.

It is not a de Polignac number, because 165713647549 - 2¹¹ = 165713645501 is a prime.

It is a super-2 number, since 2×165713647549² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165713647493 and 165713647502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165713647559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82856823774 + 82856823775.

It is an arithmetic number, because the mean of its divisors is an integer number (82856823775).

Almost surely, 2^165713647549 is an apocalyptic number.

It is an amenable number.

165713647549 is a deficient number, since it is larger than the sum of its proper divisors (1).

165713647549 is an equidigital number, since it uses as much as digits as its factorization.

165713647549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19051200, while the sum is 58.

The spelling of 165713647549 in words is "one hundred sixty-five billion, seven hundred thirteen million, six hundred forty-seven thousand, five hundred forty-nine".