666026646 has 32 divisors (see below), whose sum is σ = 1484645760. Its totient is φ = 197951616.

The previous prime is 666026597. The next prime is 666026687. The reversal of 666026646 is 646620666.

It is a happy number.

666026646 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 = 666026598 and 666026607.

It is a congruent number.

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, 169896 + ... + 173771.

It is an arithmetic number, because the mean of its divisors is an integer number (46395180).

Almost surely, 2^666026646 is an apocalyptic number.

666026646 is an abundant number, since it is smaller than the sum of its proper divisors (818619114).

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

666026646 is a wasteful number, since it uses less digits than its factorization.

666026646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343708.

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 666026646 is about 25807.4920517279. The cubic root of 666026646 is about 873.3008204524.

The spelling of 666026646 in words is "six hundred sixty-six million, twenty-six thousand, six hundred forty-six".