161805378 has 64 divisors (see below), whose sum is σ = 377874432. Its totient is φ = 45239040.

The previous prime is 161805361. The next prime is 161805389. The reversal of 161805378 is 873508161.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 488673 + ... + 489003.

It is an arithmetic number, because the mean of its divisors is an integer number (5904288).

Almost surely, 2^161805378 is an apocalyptic number.

161805378 is an abundant number, since it is smaller than the sum of its proper divisors (216069054).

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

161805378 is a wasteful number, since it uses less digits than its factorization.

161805378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 161805378 is about 12720.2742894955. The cubic root of 161805378 is about 544.9177868862.

The spelling of 161805378 in words is "one hundred sixty-one million, eight hundred five thousand, three hundred seventy-eight".