666297783 has 12 divisors (see below), whose sum is σ = 963131520. Its totient is φ = 443874816.

The previous prime is 666297773. The next prime is 666297809. The reversal of 666297783 is 387792666.

It is not a de Polignac number, because 666297783 - 2²¹ = 664200631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666297763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13591 + ... + 38952.

It is an arithmetic number, because the mean of its divisors is an integer number (80260960).

Almost surely, 2^666297783 is an apocalyptic number.

666297783 is a deficient number, since it is larger than the sum of its proper divisors (296833737).

666297783 is a wasteful number, since it uses less digits than its factorization.

666297783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53958 (or 53955 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 666297783 is about 25812.7445847976. The cubic root of 666297783 is about 873.4193102265.

The spelling of 666297783 in words is "six hundred sixty-six million, two hundred ninety-seven thousand, seven hundred eighty-three".