666623340 has 36 divisors (see below), whose sum is σ = 2022091344. Its totient is φ = 177766176.

The previous prime is 666623333. The next prime is 666623357. The reversal of 666623340 is 43326666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 666623295 and 666623304.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1851552 + ... + 1851911.

It is an arithmetic number, because the mean of its divisors is an integer number (56169204).

Almost surely, 2^666623340 is an apocalyptic number.

666623340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666623340 is an abundant number, since it is smaller than the sum of its proper divisors (1355468004).

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

666623340 is a wasteful number, since it uses less digits than its factorization.

666623340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703478 (or 3703473 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 666623340 is about 25819.0499437915. The cubic root of 666623340 is about 873.5615396615.

The spelling of 666623340 in words is "six hundred sixty-six million, six hundred twenty-three thousand, three hundred forty".