163125661 has 2 divisors, whose sum is σ = 163125662. Its totient is φ = 163125660.

The previous prime is 163125643. The next prime is 163125701. The reversal of 163125661 is 166521361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 1454436 = 12715^2 + 1206^2 .

It is a cyclic number.

It is not a de Polignac number, because 163125661 - 2⁷ = 163125533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163125601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81562830 + 81562831.

It is an arithmetic number, because the mean of its divisors is an integer number (81562831).

Almost surely, 2^163125661 is an apocalyptic number.

It is an amenable number.

163125661 is a deficient number, since it is larger than the sum of its proper divisors (1).

163125661 is an equidigital number, since it uses as much as digits as its factorization.

163125661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 163125661 is about 12772.0656512563. The cubic root of 163125661 is about 546.3958953440.

The spelling of 163125661 in words is "one hundred sixty-three million, one hundred twenty-five thousand, six hundred sixty-one".