161216694 has 12 divisors (see below), whose sum is σ = 349302876. Its totient is φ = 53738892.

The previous prime is 161216669. The next prime is 161216701. The reversal of 161216694 is 496612161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4478224 + ... + 4478259.

It is an arithmetic number, because the mean of its divisors is an integer number (29108573).

Almost surely, 2^161216694 is an apocalyptic number.

161216694 is an abundant number, since it is smaller than the sum of its proper divisors (188086182).

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

161216694 is a wasteful number, since it uses less digits than its factorization.

161216694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8956491 (or 8956488 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 161216694 is about 12697.1136090058. The cubic root of 161216694 is about 544.2561397415.

The spelling of 161216694 in words is "one hundred sixty-one million, two hundred sixteen thousand, six hundred ninety-four".