666944146 has 16 divisors (see below), whose sum is σ = 1128997440. Its totient is φ = 292702480.

The previous prime is 666944143. The next prime is 666944167. The reversal of 666944146 is 641449666.

It is a junction number, because it is equal to n+sod(n) for n = 666944096 and 666944105.

It is not an unprimeable number, because it can be changed into a prime (666944141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522046 + ... + 523321.

It is an arithmetic number, because the mean of its divisors is an integer number (70562340).

Almost surely, 2^666944146 is an apocalyptic number.

666944146 is a deficient number, since it is larger than the sum of its proper divisors (462053294).

666944146 is a wasteful number, since it uses less digits than its factorization.

666944146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045409.

The product of its digits is 746496, while the sum is 46.

The square root of 666944146 is about 25825.2617798930. The cubic root of 666944146 is about 873.7016481874.

The spelling of 666944146 in words is "six hundred sixty-six million, nine hundred forty-four thousand, one hundred forty-six".