666887763 has 4 divisors (see below), whose sum is σ = 889183688. Its totient is φ = 444591840.

The previous prime is 666887723. The next prime is 666887789. The reversal of 666887763 is 367788666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 666887763 - 2⁶ = 666887699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666887723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111147958 + ... + 111147963.

It is an arithmetic number, because the mean of its divisors is an integer number (222295922).

Almost surely, 2^666887763 is an apocalyptic number.

666887763 is a deficient number, since it is larger than the sum of its proper divisors (222295925).

666887763 is a wasteful number, since it uses less digits than its factorization.

666887763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222295924.

The product of its digits is 12192768, while the sum is 57.

The square root of 666887763 is about 25824.1701318745. The cubic root of 666887763 is about 873.6770267811.

The spelling of 666887763 in words is "six hundred sixty-six million, eight hundred eighty-seven thousand, seven hundred sixty-three".