21627076666 has 8 divisors (see below), whose sum is σ = 34936046964. Its totient is φ = 9981727680.

The previous prime is 21627076657. The next prime is 21627076693. The reversal of 21627076666 is 66667072612.

It can be written as a sum of positive squares in 2 ways, for example, as 16840512441 + 4786564225 = 129771^2 + 69185^2 .

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415905295 + ... + 415905346.

Almost surely, 2^21627076666 is an apocalyptic number.

21627076666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21627076666 is a deficient number, since it is larger than the sum of its proper divisors (13308970298).

21627076666 is a wasteful number, since it uses less digits than its factorization.

21627076666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831810656.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 21627076666 in words is "twenty-one billion, six hundred twenty-seven million, seventy-six thousand, six hundred sixty-six".