661303166 has 8 divisors (see below), whose sum is σ = 993852984. Its totient is φ = 330018840.

The previous prime is 661303127. The next prime is 661303169.

661303166 is nontrivially palindromic in base 10.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661303169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315065 + ... + 317156.

It is an arithmetic number, because the mean of its divisors is an integer number (124231623).

Almost surely, 2^661303166 is an apocalyptic number.

661303166 is a deficient number, since it is larger than the sum of its proper divisors (332549818).

661303166 is a wasteful number, since it uses less digits than its factorization.

661303166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632746.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 661303166 is about 25715.8154838613. The cubic root of 661303166 is about 871.2314291989.

It can be divided in two parts, 66130 and 3166, that added together give a palindrome (69296).

The spelling of 661303166 in words is "six hundred sixty-one million, three hundred three thousand, one hundred sixty-six".