667646386 has 8 divisors (see below), whose sum is σ = 1092512304. Its totient is φ = 303475620.

The previous prime is 667646383. The next prime is 667646429. The reversal of 667646386 is 683646766.

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

It is not an unprimeable number, because it can be changed into a prime (667646383) 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, 15173760 + ... + 15173803.

It is an arithmetic number, because the mean of its divisors is an integer number (136564038).

Almost surely, 2^667646386 is an apocalyptic number.

667646386 is a deficient number, since it is larger than the sum of its proper divisors (424865918).

667646386 is a wasteful number, since it uses less digits than its factorization.

667646386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347576.

The product of its digits is 5225472, while the sum is 52.

The square root of 667646386 is about 25838.8541928623. The cubic root of 667646386 is about 874.0081871160.

The spelling of 667646386 in words is "six hundred sixty-seven million, six hundred forty-six thousand, three hundred eighty-six".