451216666 has 8 divisors (see below), whose sum is σ = 689595444. Its totient is φ = 221351520.

The previous prime is 451216651. The next prime is 451216679. The reversal of 451216666 is 666612154.

It can be written as a sum of positive squares in 2 ways, for example, as 431600625 + 19616041 = 20775^2 + 4429^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128275 + ... + 2128486.

Almost surely, 2^451216666 is an apocalyptic number.

451216666 is a deficient number, since it is larger than the sum of its proper divisors (238378778).

451216666 is a wasteful number, since it uses less digits than its factorization.

451216666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256816.

The product of its digits is 51840, while the sum is 37.

The square root of 451216666 is about 21241.8611708108. The cubic root of 451216666 is about 766.9994350845. Note that the first 3 decimals are identical.

The spelling of 451216666 in words is "four hundred fifty-one million, two hundred sixteen thousand, six hundred sixty-six".