421166672866 has 8 divisors (see below), whose sum is σ = 633539670444. Its totient is φ = 209986782720.

The previous prime is 421166672837. The next prime is 421166672869. The reversal of 421166672866 is 668276661124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 412632793225 + 8533879641 = 642365^2 + 92379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (421166672869) 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, 298275975 + ... + 298277386.

Almost surely, 2^421166672866 is an apocalyptic number.

421166672866 is a deficient number, since it is larger than the sum of its proper divisors (212372997578).

421166672866 is a wasteful number, since it uses less digits than its factorization.

421166672866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596553716.

The product of its digits is 6967296, while the sum is 55.

The spelling of 421166672866 in words is "four hundred twenty-one billion, one hundred sixty-six million, six hundred seventy-two thousand, eight hundred sixty-six".