666707563 has 4 divisors (see below), whose sum is σ = 666759208. Its totient is φ = 666655920.

The previous prime is 666707533. The next prime is 666707579. The reversal of 666707563 is 365707666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 666707563 - 2⁹ = 666707051 is a prime.

It is a super-2 number, since 2×666707563² = 888997949122797938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666707533) 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, 12520 + ... + 38602.

It is an arithmetic number, because the mean of its divisors is an integer number (166689802).

Almost surely, 2^666707563 is an apocalyptic number.

666707563 is a deficient number, since it is larger than the sum of its proper divisors (51645).

666707563 is a wasteful number, since it uses less digits than its factorization.

666707563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51644.

The product of its (nonzero) digits is 952560, while the sum is 46.

The square root of 666707563 is about 25820.6809166606. The cubic root of 666707563 is about 873.5983274900.

The spelling of 666707563 in words is "six hundred sixty-six million, seven hundred seven thousand, five hundred sixty-three".