161506866 has 16 divisors (see below), whose sum is σ = 323150688. Its totient is φ = 53812800.

The previous prime is 161506861. The next prime is 161506871. The reversal of 161506866 is 668605161.

It is an interprime number because it is at equal distance from previous prime (161506861) and next prime (161506871).

It is not an unprimeable number, because it can be changed into a prime (161506861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15946 + ... + 24026.

It is an arithmetic number, because the mean of its divisors is an integer number (20196918).

Almost surely, 2^161506866 is an apocalyptic number.

161506866 is an abundant number, since it is smaller than the sum of its proper divisors (161643822).

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

161506866 is a wasteful number, since it uses less digits than its factorization.

161506866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11417.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 161506866 is about 12708.5351634246. The cubic root of 161506866 is about 544.5824774023.

The spelling of 161506866 in words is "one hundred sixty-one million, five hundred six thousand, eight hundred sixty-six".