161788566 has 32 divisors (see below), whose sum is σ = 334798848. Its totient is φ = 52067520.

The previous prime is 161788559. The next prime is 161788573. The reversal of 161788566 is 665887161.

It is an interprime number because it is at equal distance from previous prime (161788559) and next prime (161788573).

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 112186 + ... + 113618.

It is an arithmetic number, because the mean of its divisors is an integer number (10462464).

Almost surely, 2^161788566 is an apocalyptic number.

161788566 is an abundant number, since it is smaller than the sum of its proper divisors (173010282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161788566 is a wasteful number, since it uses less digits than its factorization.

161788566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076.

The product of its digits is 483840, while the sum is 48.

The square root of 161788566 is about 12719.6134375224. The cubic root of 161788566 is about 544.8989134403.

The spelling of 161788566 in words is "one hundred sixty-one million, seven hundred eighty-eight thousand, five hundred sixty-six".