161857330 has 8 divisors (see below), whose sum is σ = 291343212. Its totient is φ = 64742928.

The previous prime is 161857307. The next prime is 161857337. The reversal of 161857330 is 33758161.

It can be written as a sum of positive squares in 2 ways, for example, as 161823841 + 33489 = 12721^2 + 183^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (161857337) 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, 8092857 + ... + 8092876.

Almost surely, 2^161857330 is an apocalyptic number.

161857330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161857330 is a deficient number, since it is larger than the sum of its proper divisors (129485882).

161857330 is a wasteful number, since it uses less digits than its factorization.

161857330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16185740.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 161857330 is about 12722.3162199342. The cubic root of 161857330 is about 544.9761008514.

The spelling of 161857330 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, three hundred thirty".