161959605 has 8 divisors (see below), whose sum is σ = 259135392. Its totient is φ = 86378448.

The previous prime is 161959597. The next prime is 161959607. The reversal of 161959605 is 506959161.

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

It is not a de Polignac number, because 161959605 - 2³ = 161959597 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161959607) 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, 5398639 + ... + 5398668.

It is an arithmetic number, because the mean of its divisors is an integer number (32391924).

Almost surely, 2^161959605 is an apocalyptic number.

161959605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161959605 is a deficient number, since it is larger than the sum of its proper divisors (97175787).

161959605 is a wasteful number, since it uses less digits than its factorization.

161959605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10797315.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 161959605 is about 12726.3350969554. The cubic root of 161959605 is about 545.0908638446.

The spelling of 161959605 in words is "one hundred sixty-one million, nine hundred fifty-nine thousand, six hundred five".