163866646 has 8 divisors (see below), whose sum is σ = 254275920. Its totient is φ = 79108008.

The previous prime is 163866643. The next prime is 163866649. The reversal of 163866646 is 646668361.

It is an interprime number because it is at equal distance from previous prime (163866643) and next prime (163866649).

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

It is a junction number, because it is equal to n+sod(n) for n = 163866596 and 163866605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163866641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412586 + ... + 1412701.

It is an arithmetic number, because the mean of its divisors is an integer number (31784490).

Almost surely, 2^163866646 is an apocalyptic number.

163866646 is a deficient number, since it is larger than the sum of its proper divisors (90409274).

163866646 is a wasteful number, since it uses less digits than its factorization.

163866646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825318.

The product of its digits is 746496, while the sum is 46.

The square root of 163866646 is about 12801.0408170586. The cubic root of 163866646 is about 547.2219654035.

It can be divided in two parts, 16386 and 6646, that added together give a palindrome (23032).

The spelling of 163866646 in words is "one hundred sixty-three million, eight hundred sixty-six thousand, six hundred forty-six".