161902686 has 128 divisors (see below), whose sum is σ = 394813440. Its totient is φ = 43718400.

The previous prime is 161902607. The next prime is 161902687. The reversal of 161902686 is 686209161.

161902686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161902687) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2416425 + ... + 2416491.

It is an arithmetic number, because the mean of its divisors is an integer number (3084480).

Almost surely, 2^161902686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161902686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197406720).

161902686 is an abundant number, since it is smaller than the sum of its proper divisors (232910754).

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

161902686 is a wasteful number, since it uses less digits than its factorization.

161902686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 161902686 is about 12724.0986321232. The cubic root of 161902686 is about 545.0270008787.

The spelling of 161902686 in words is "one hundred sixty-one million, nine hundred two thousand, six hundred eighty-six".