661000166 has 8 divisors (see below), whose sum is σ = 1023484224. Its totient is φ = 319838760.

The previous prime is 661000159. The next prime is 661000169.

661000166 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661000169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5330585 + ... + 5330708.

It is an arithmetic number, because the mean of its divisors is an integer number (127935528).

Almost surely, 2^661000166 is an apocalyptic number.

661000166 is a deficient number, since it is larger than the sum of its proper divisors (362484058).

661000166 is a wasteful number, since it uses less digits than its factorization.

661000166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661326.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 661000166 is about 25709.9234926905. The cubic root of 661000166 is about 871.0983467920.

It can be divided in two parts, 661000 and 166, that added together give a palindrome (661166).

The spelling of 661000166 in words is "six hundred sixty-one million, one hundred sixty-six", and thus it is an aban number.