165001601 has 2 divisors, whose sum is σ = 165001602. Its totient is φ = 165001600.

The previous prime is 165001547. The next prime is 165001649. The reversal of 165001601 is 106100561.

It is a happy number.

165001601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156850576 + 8151025 = 12524^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 165001601 - 2¹⁸ = 164739457 is a prime.

It is not a weakly prime, because it can be changed into another prime (165001801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82500800 + 82500801.

It is an arithmetic number, because the mean of its divisors is an integer number (82500801).

Almost surely, 2^165001601 is an apocalyptic number.

It is an amenable number.

165001601 is a deficient number, since it is larger than the sum of its proper divisors (1).

165001601 is an equidigital number, since it uses as much as digits as its factorization.

165001601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 165001601 is about 12845.2948973544. The cubic root of 165001601 is about 548.4824292123.

The spelling of 165001601 in words is "one hundred sixty-five million, one thousand, six hundred one".