666630040 has 16 divisors (see below), whose sum is σ = 1499917680. Its totient is φ = 266652000.

The previous prime is 666630031. The next prime is 666630077. The reversal of 666630040 is 40036666.

It is a super-2 number, since 2×666630040² = 888791220460803200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666629984 and 666630011.

It is a congruent 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, 8332836 + ... + 8332915.

It is an arithmetic number, because the mean of its divisors is an integer number (93744855).

Almost surely, 2^666630040 is an apocalyptic number.

It is an amenable number.

666630040 is an abundant number, since it is smaller than the sum of its proper divisors (833287640).

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

666630040 is a wasteful number, since it uses less digits than its factorization.

666630040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16665762 (or 16665758 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 666630040 is about 25819.1796926239. The cubic root of 666630040 is about 873.5644662731.

The spelling of 666630040 in words is "six hundred sixty-six million, six hundred thirty thousand, forty".