6662121766 has 8 divisors (see below), whose sum is σ = 10130075784. Its totient is φ = 3285429840.

The previous prime is 6662121761. The next prime is 6662121803. The reversal of 6662121766 is 6671212666.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6662121761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22815340 + ... + 22815631.

It is an arithmetic number, because the mean of its divisors is an integer number (1266259473).

Almost surely, 2^6662121766 is an apocalyptic number.

6662121766 is a deficient number, since it is larger than the sum of its proper divisors (3467954018).

6662121766 is a wasteful number, since it uses less digits than its factorization.

6662121766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45631046.

The product of its digits is 217728, while the sum is 43.

The square root of 6662121766 is about 81621.8216287777. The cubic root of 6662121766 is about 1881.6442690070.

The spelling of 6662121766 in words is "six billion, six hundred sixty-two million, one hundred twenty-one thousand, seven hundred sixty-six".