161520378 has 16 divisors (see below), whose sum is σ = 325585920. Its totient is φ = 53415936.

The previous prime is 161520371. The next prime is 161520391. The reversal of 161520378 is 873025161.

161520378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161520371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105223 + ... + 106746.

It is an arithmetic number, because the mean of its divisors is an integer number (20349120).

Almost surely, 2^161520378 is an apocalyptic number.

161520378 is an abundant number, since it is smaller than the sum of its proper divisors (164065542).

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

161520378 is a wasteful number, since it uses less digits than its factorization.

161520378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212101.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 161520378 is about 12709.0667635354. The cubic root of 161520378 is about 544.5976639460.

The spelling of 161520378 in words is "one hundred sixty-one million, five hundred twenty thousand, three hundred seventy-eight".