161066403 has 6 divisors (see below), whose sum is σ = 232651484. Its totient is φ = 107377596.

The previous prime is 161066371. The next prime is 161066407. The reversal of 161066403 is 304660161.

161066403 is a `hidden beast` number, since 1 + 6 + 10 + 6 + 640 + 3 = 666.

It is not a de Polignac number, because 161066403 - 2⁵ = 161066371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161066407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8948125 + ... + 8948142.

Almost surely, 2^161066403 is an apocalyptic number.

161066403 is a deficient number, since it is larger than the sum of its proper divisors (71585081).

161066403 is a wasteful number, since it uses less digits than its factorization.

161066403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17896273 (or 17896270 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 161066403 is about 12691.1939154675. The cubic root of 161066403 is about 544.0869632366.

The spelling of 161066403 in words is "one hundred sixty-one million, sixty-six thousand, four hundred three".