161569567 has 2 divisors, whose sum is σ = 161569568. Its totient is φ = 161569566.

The previous prime is 161569537. The next prime is 161569591. The reversal of 161569567 is 765965161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161569567 - 2²³ = 153180959 is a prime.

It is a super-2 number, since 2×161569567² = 52209449961134978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161569537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80784783 + 80784784.

It is an arithmetic number, because the mean of its divisors is an integer number (80784784).

Almost surely, 2^161569567 is an apocalyptic number.

161569567 is a deficient number, since it is larger than the sum of its proper divisors (1).

161569567 is an equidigital number, since it uses as much as digits as its factorization.

161569567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 46.

The square root of 161569567 is about 12711.0018094562. The cubic root of 161569567 is about 544.6529417917.

Subtracting from 161569567 its sum of digits (46), we obtain a square (161569521 = 12711²).

The spelling of 161569567 in words is "one hundred sixty-one million, five hundred sixty-nine thousand, five hundred sixty-seven".