161033380 has 12 divisors (see below), whose sum is σ = 338170140. Its totient is φ = 64413344.

The previous prime is 161033377. The next prime is 161033423. The reversal of 161033380 is 83330161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89529444 + 71503936 = 9462^2 + 8456^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4025815 + ... + 4025854.

It is an arithmetic number, because the mean of its divisors is an integer number (28180845).

Almost surely, 2^161033380 is an apocalyptic number.

161033380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161033380 is an abundant number, since it is smaller than the sum of its proper divisors (177136760).

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

161033380 is a wasteful number, since it uses less digits than its factorization.

161033380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8051678 (or 8051676 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 161033380 is about 12689.8928285467. The cubic root of 161033380 is about 544.0497764790.

The spelling of 161033380 in words is "one hundred sixty-one million, thirty-three thousand, three hundred eighty".