165680149 has 2 divisors, whose sum is σ = 165680150. Its totient is φ = 165680148.

The previous prime is 165680107. The next prime is 165680153. The reversal of 165680149 is 941086561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115412049 + 50268100 = 10743^2 + 7090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165680149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165680159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82840074 + 82840075.

It is an arithmetic number, because the mean of its divisors is an integer number (82840075).

Almost surely, 2^165680149 is an apocalyptic number.

It is an amenable number.

165680149 is a deficient number, since it is larger than the sum of its proper divisors (1).

165680149 is an equidigital number, since it uses as much as digits as its factorization.

165680149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 165680149 is about 12871.6801156648. The cubic root of 165680149 is about 549.2332555600.

The spelling of 165680149 in words is "one hundred sixty-five million, six hundred eighty thousand, one hundred forty-nine".