161615669 has 2 divisors, whose sum is σ = 161615670. Its totient is φ = 161615668.

The previous prime is 161615647. The next prime is 161615683. The reversal of 161615669 is 966516161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140730769 + 20884900 = 11863^2 + 4570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161615669 is a prime.

It is a super-2 number, since 2×161615669² = 52239248932635122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161615639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80807834 + 80807835.

It is an arithmetic number, because the mean of its divisors is an integer number (80807835).

Almost surely, 2^161615669 is an apocalyptic number.

It is an amenable number.

161615669 is a deficient number, since it is larger than the sum of its proper divisors (1).

161615669 is an equidigital number, since it uses as much as digits as its factorization.

161615669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 161615669 is about 12712.8151485027. The cubic root of 161615669 is about 544.7047403297.

The spelling of 161615669 in words is "one hundred sixty-one million, six hundred fifteen thousand, six hundred sixty-nine".