666424722 has 8 divisors (see below), whose sum is σ = 1332849456. Its totient is φ = 222141572.

The previous prime is 666424711. The next prime is 666424739. The reversal of 666424722 is 227424666.

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

666424722 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55535388 + ... + 55535399.

It is an arithmetic number, because the mean of its divisors is an integer number (166606182).

Almost surely, 2^666424722 is an apocalyptic number.

666424722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666424722 is a wasteful number, since it uses less digits than its factorization.

666424722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111070792.

The product of its digits is 193536, while the sum is 39.

The square root of 666424722 is about 25815.2033112273. The cubic root of 666424722 is about 873.4747728823.

The spelling of 666424722 in words is "six hundred sixty-six million, four hundred twenty-four thousand, seven hundred twenty-two".