666293646 has 16 divisors (see below), whose sum is σ = 1333030608. Its totient is φ = 222024000.

The previous prime is 666293629. The next prime is 666293671. The reversal of 666293646 is 646392666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666293595 and 666293604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2986 + ... + 36626.

It is an arithmetic number, because the mean of its divisors is an integer number (83314413).

Almost surely, 2^666293646 is an apocalyptic number.

666293646 is an abundant number, since it is smaller than the sum of its proper divisors (666736962).

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

666293646 is a wasteful number, since it uses less digits than its factorization.

666293646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36947.

The product of its digits is 1679616, while the sum is 48.

The square root of 666293646 is about 25812.6644498393. The cubic root of 666293646 is about 873.4175025547.

The spelling of 666293646 in words is "six hundred sixty-six million, two hundred ninety-three thousand, six hundred forty-six".