666350388 has 180 divisors, whose sum is σ = 2000681760. Its totient is φ = 192883680.

The previous prime is 666350359. The next prime is 666350389. The reversal of 666350388 is 883053666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666350389) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 901323 + ... + 902061.

Almost surely, 2^666350388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666350388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000340880).

666350388 is an abundant number, since it is smaller than the sum of its proper divisors (1334331372).

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

666350388 is a wasteful number, since it uses less digits than its factorization.

666350388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 666350388 is about 25813.7635380818. The cubic root of 666350388 is about 873.4422954517.

The spelling of 666350388 in words is "six hundred sixty-six million, three hundred fifty thousand, three hundred eighty-eight".