666722046 has 32 divisors (see below), whose sum is σ = 1407945600. Its totient is φ = 209895840.

The previous prime is 666722039. The next prime is 666722047. The reversal of 666722046 is 640227666.

It is a super-2 number, since 2×666722046² = 889036573244852232, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666721995 and 666722013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666722047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28900 + ... + 46568.

It is an arithmetic number, because the mean of its divisors is an integer number (43998300).

Almost surely, 2^666722046 is an apocalyptic number.

666722046 is an abundant number, since it is smaller than the sum of its proper divisors (741223554).

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

666722046 is a wasteful number, since it uses less digits than its factorization.

666722046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18024.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 666722046 is about 25820.9613686245. The cubic root of 666722046 is about 873.6046532184.

The spelling of 666722046 in words is "six hundred sixty-six million, seven hundred twenty-two thousand, forty-six".