666722 has 8 divisors (see below), whose sum is σ = 1142976. Its totient is φ = 285732.

The previous prime is 666707. The next prime is 666727. The reversal of 666722 is 227666.

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 (666727) 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, 23798 + ... + 23825.

It is an arithmetic number, because the mean of its divisors is an integer number (142872).

2⁶⁶⁶⁷²² is an apocalyptic number.

666722 is a deficient number, since it is larger than the sum of its proper divisors (476254).

666722 is a wasteful number, since it uses less digits than its factorization.

666722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47632.

The product of its digits is 6048, while the sum is 29.

The square root of 666722 is about 816.5304648328. The cubic root of 666722 is about 87.3604633127.

The spelling of 666722 in words is "six hundred sixty-six thousand, seven hundred twenty-two".