165001649 has 2 divisors, whose sum is σ = 165001650. Its totient is φ = 165001648.

The previous prime is 165001601. The next prime is 165001687. The reversal of 165001649 is 946100561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108826624 + 56175025 = 10432^2 + 7495^2 .

It is a cyclic number.

It is not a de Polignac number, because 165001649 - 2²⁰ = 163953073 is a prime.

It is a Chen prime.

It is equal to p_9239063 and since 165001649 and 9239063 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165004649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82500824 + 82500825.

It is an arithmetic number, because the mean of its divisors is an integer number (82500825).

Almost surely, 2^165001649 is an apocalyptic number.

It is an amenable number.

165001649 is a deficient number, since it is larger than the sum of its proper divisors (1).

165001649 is an equidigital number, since it uses as much as digits as its factorization.

165001649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 165001649 is about 12845.2967657427. The cubic root of 165001649 is about 548.4824823980.

The spelling of 165001649 in words is "one hundred sixty-five million, one thousand, six hundred forty-nine".