666694152 has 80 divisors (see below), whose sum is σ = 1875258000. Its totient is φ = 221292000.

The previous prime is 666694141. The next prime is 666694183. The reversal of 666694152 is 251496666.

666694152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666694098 and 666694107.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 160599 + ... + 164697.

It is an arithmetic number, because the mean of its divisors is an integer number (23440725).

Almost surely, 2^666694152 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 666694152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937629000).

666694152 is an abundant number, since it is smaller than the sum of its proper divisors (1208563848).

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

666694152 is a wasteful number, since it uses less digits than its factorization.

666694152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4368 (or 4355 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 666694152 is about 25820.4212204216. The cubic root of 666694152 is about 873.5924698965.

The spelling of 666694152 in words is "six hundred sixty-six million, six hundred ninety-four thousand, one hundred fifty-two".