666666733380 has 48 divisors (see below), whose sum is σ = 1866760756224. Its totient is φ = 177768852480.

The previous prime is 666666733379. The next prime is 666666733391. The reversal of 666666733380 is 83337666666.

It is a happy number.

666666733380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969309 + ... + 1507611.

It is an arithmetic number, because the mean of its divisors is an integer number (38890849088).

Almost surely, 2^666666733380 is an apocalyptic number.

666666733380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666666733380 is an abundant number, since it is smaller than the sum of its proper divisors (1200094022844).

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

666666733380 is a wasteful number, since it uses less digits than its factorization.

666666733380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558956 (or 558954 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 60.

The spelling of 666666733380 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred thirty-three thousand, three hundred eighty".