161606378 has 16 divisors (see below), whose sum is σ = 248511240. Its totient is φ = 78794496.

The previous prime is 161606371. The next prime is 161606387. The reversal of 161606378 is 873606161.

It can be written as a sum of positive squares in 4 ways, for example, as 74874409 + 86731969 = 8653^2 + 9313^2 .

It is a super-2 number, since 2×161606378² = 52233242820557768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161606371) 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, 6776 + ... + 19212.

Almost surely, 2^161606378 is an apocalyptic number.

161606378 is a deficient number, since it is larger than the sum of its proper divisors (86904862).

161606378 is a wasteful number, since it uses less digits than its factorization.

161606378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12601.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 161606378 is about 12712.4497245810. The cubic root of 161606378 is about 544.6943020911.

The spelling of 161606378 in words is "one hundred sixty-one million, six hundred six thousand, three hundred seventy-eight".