161666834 has 8 divisors (see below), whose sum is σ = 277143168. Its totient is φ = 69285780.

The previous prime is 161666833. The next prime is 161666837. The reversal of 161666834 is 438666161.

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

It is a super-2 number, since 2×161666834² = 52272330431167112, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161666791 and 161666800.

It is not an unprimeable number, because it can be changed into a prime (161666833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5773802 + ... + 5773829.

It is an arithmetic number, because the mean of its divisors is an integer number (34642896).

Almost surely, 2^161666834 is an apocalyptic number.

161666834 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161666834 is a deficient number, since it is larger than the sum of its proper divisors (115476334).

161666834 is a wasteful number, since it uses less digits than its factorization.

161666834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11547640.

The product of its digits is 124416, while the sum is 41.

The square root of 161666834 is about 12714.8273287528. The cubic root of 161666834 is about 544.7622159397.

The spelling of 161666834 in words is "one hundred sixty-one million, six hundred sixty-six thousand, eight hundred thirty-four".