6213768666 has 16 divisors (see below), whose sum is σ = 14202899904. Its totient is φ = 1775362464.

The previous prime is 6213768661. The next prime is 6213768679. The reversal of 6213768666 is 6668673126.

It is a super-2 number, since 2×6213768666² = 77221842069126839112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6213768661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73973395 + ... + 73973478.

It is an arithmetic number, because the mean of its divisors is an integer number (887681244).

Almost surely, 2^6213768666 is an apocalyptic number.

6213768666 is an abundant number, since it is smaller than the sum of its proper divisors (7989131238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6213768666 is a wasteful number, since it uses less digits than its factorization.

6213768666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147946885.

The product of its digits is 2612736, while the sum is 51.

The square root of 6213768666 is about 78827.4613697536. The cubic root of 6213768666 is about 1838.4494524414.

The spelling of 6213768666 in words is "six billion, two hundred thirteen million, seven hundred sixty-eight thousand, six hundred sixty-six".