666419827 has 4 divisors (see below), whose sum is σ = 678993840. Its totient is φ = 653845816.

The previous prime is 666419801. The next prime is 666419833. The reversal of 666419827 is 728914666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666419827 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666419857) 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, 6286927 + ... + 6287032.

It is an arithmetic number, because the mean of its divisors is an integer number (169748460).

Almost surely, 2^666419827 is an apocalyptic number.

666419827 is a deficient number, since it is larger than the sum of its proper divisors (12574013).

666419827 is a wasteful number, since it uses less digits than its factorization.

666419827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12574012.

The product of its digits is 870912, while the sum is 49.

The square root of 666419827 is about 25815.1085025804. The cubic root of 666419827 is about 873.4726342714.

The spelling of 666419827 in words is "six hundred sixty-six million, four hundred nineteen thousand, eight hundred twenty-seven".