499806666 has 48 divisors (see below), whose sum is σ = 1172260800. Its totient is φ = 157827528.

The previous prime is 499806653. The next prime is 499806679. The reversal of 499806666 is 666608994.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (499806653) and next prime (499806679).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6675 + ... + 32313.

It is an arithmetic number, because the mean of its divisors is an integer number (24422100).

Almost surely, 2^499806666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 499806666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (586130400).

499806666 is an abundant number, since it is smaller than the sum of its proper divisors (672454134).

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

499806666 is a wasteful number, since it uses less digits than its factorization.

499806666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25688 (or 25663 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The square root of 499806666 is about 22356.3562773543. The cubic root of 499806666 is about 793.5982132643.

The spelling of 499806666 in words is "four hundred ninety-nine million, eight hundred six thousand, six hundred sixty-six".