165566611417 has 2 divisors, whose sum is σ = 165566611418. Its totient is φ = 165566611416.

The previous prime is 165566611403. The next prime is 165566611501. The reversal of 165566611417 is 714116665561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138570807001 + 26995804416 = 372251^2 + 164304^2 .

It is a cyclic number.

It is not a de Polignac number, because 165566611417 - 2²⁷ = 165432393689 is a prime.

It is a super-2 number, since 2×165566611417² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165516611417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82783305708 + 82783305709.

It is an arithmetic number, because the mean of its divisors is an integer number (82783305709).

Almost surely, 2^165566611417 is an apocalyptic number.

It is an amenable number.

165566611417 is a deficient number, since it is larger than the sum of its proper divisors (1).

165566611417 is an equidigital number, since it uses as much as digits as its factorization.

165566611417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The spelling of 165566611417 in words is "one hundred sixty-five billion, five hundred sixty-six million, six hundred eleven thousand, four hundred seventeen".