165574649 has 2 divisors, whose sum is σ = 165574650. Its totient is φ = 165574648.

The previous prime is 165574613. The next prime is 165574657. The reversal of 165574649 is 946475561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103164649 + 62410000 = 10157^2 + 7900^2 .

It is a cyclic number.

It is not a de Polignac number, because 165574649 - 2⁸ = 165574393 is a prime.

It is not a weakly prime, because it can be changed into another prime (165174649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82787324 + 82787325.

It is an arithmetic number, because the mean of its divisors is an integer number (82787325).

Almost surely, 2^165574649 is an apocalyptic number.

It is an amenable number.

165574649 is a deficient number, since it is larger than the sum of its proper divisors (1).

165574649 is an equidigital number, since it uses as much as digits as its factorization.

165574649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 165574649 is about 12867.5813189581. The cubic root of 165574649 is about 549.1166525507.

The spelling of 165574649 in words is "one hundred sixty-five million, five hundred seventy-four thousand, six hundred forty-nine".