161566001 has 2 divisors, whose sum is σ = 161566002. Its totient is φ = 161566000.

The previous prime is 161565991. The next prime is 161566019. The reversal of 161566001 is 100665161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124902976 + 36663025 = 11176^2 + 6055^2 .

It is a cyclic number.

It is not a de Polignac number, because 161566001 - 2¹⁴ = 161549617 is a prime.

It is a super-2 number, since 2×161566001² = 52207145358264002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161566021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80783000 + 80783001.

It is an arithmetic number, because the mean of its divisors is an integer number (80783001).

Almost surely, 2^161566001 is an apocalyptic number.

It is an amenable number.

161566001 is a deficient number, since it is larger than the sum of its proper divisors (1).

161566001 is an equidigital number, since it uses as much as digits as its factorization.

161566001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 161566001 is about 12710.8615364970. The cubic root of 161566001 is about 544.6489347527.

The spelling of 161566001 in words is "one hundred sixty-one million, five hundred sixty-six thousand, one".