165694541 has 2 divisors, whose sum is σ = 165694542. Its totient is φ = 165694540.

The previous prime is 165694511. The next prime is 165694559. The reversal of 165694541 is 145496561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165225316 + 469225 = 12854^2 + 685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165694541 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165694511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82847270 + 82847271.

It is an arithmetic number, because the mean of its divisors is an integer number (82847271).

Almost surely, 2^165694541 is an apocalyptic number.

It is an amenable number.

165694541 is a deficient number, since it is larger than the sum of its proper divisors (1).

165694541 is an equidigital number, since it uses as much as digits as its factorization.

165694541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 165694541 is about 12872.2391603015. The cubic root of 165694541 is about 549.2491583626.

The spelling of 165694541 in words is "one hundred sixty-five million, six hundred ninety-four thousand, five hundred forty-one".