666782496 has 48 divisors (see below), whose sum is σ = 1944784800. Its totient is φ = 222260544.

The previous prime is 666782401. The next prime is 666782527. The reversal of 666782496 is 694287666.

666782496 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 385006 + ... + 386733.

It is an arithmetic number, because the mean of its divisors is an integer number (40516350).

Almost surely, 2^666782496 is an apocalyptic number.

It is an amenable number.

666782496 is an abundant number, since it is smaller than the sum of its proper divisors (1278002304).

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

666782496 is a wasteful number, since it uses less digits than its factorization.

666782496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771758 (or 771744 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 666782496 is about 25822.1319026915. The cubic root of 666782496 is about 873.6310549279.

The spelling of 666782496 in words is "six hundred sixty-six million, seven hundred eighty-two thousand, four hundred ninety-six".