161966407 has 8 divisors (see below), whose sum is σ = 166944672. Its totient is φ = 157063200.

The previous prime is 161966401. The next prime is 161966411. The reversal of 161966407 is 704669161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161966407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161966407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161966401) 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, 14368 + ... + 23029.

It is an arithmetic number, because the mean of its divisors is an integer number (20868084).

Almost surely, 2^161966407 is an apocalyptic number.

161966407 is a deficient number, since it is larger than the sum of its proper divisors (4978265).

161966407 is an equidigital number, since it uses as much as digits as its factorization.

161966407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37529.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 161966407 is about 12726.6023352661. The cubic root of 161966407 is about 545.0984946695.

The spelling of 161966407 in words is "one hundred sixty-one million, nine hundred sixty-six thousand, four hundred seven".