161868912 has 20 divisors (see below), whose sum is σ = 418161480. Its totient is φ = 53956288.

The previous prime is 161868901. The next prime is 161868913. The reversal of 161868912 is 219868161.

161868912 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161868913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686087 + ... + 1686182.

It is an arithmetic number, because the mean of its divisors is an integer number (20908074).

Almost surely, 2^161868912 is an apocalyptic number.

161868912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161868912 is an abundant number, since it is smaller than the sum of its proper divisors (256292568).

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

161868912 is a wasteful number, since it uses less digits than its factorization.

161868912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372280 (or 3372274 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 161868912 is about 12722.7713962014. The cubic root of 161868912 is about 544.9890994649.

The spelling of 161868912 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, nine hundred twelve".