6406021709966 has 16 divisors (see below), whose sum is σ = 10036754042400. Its totient is φ = 3060713069568.

The previous prime is 6406021709957. The next prime is 6406021709987. The reversal of 6406021709966 is 6699071206046.

It is a happy number.

It is a super-2 number, since 2×6406021709966² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 68963171 + ... + 69055998.

It is an arithmetic number, because the mean of its divisors is an integer number (627297127650).

Almost surely, 2^{6406021709966} is an apocalyptic number.

6406021709966 is a deficient number, since it is larger than the sum of its proper divisors (3630732332434).

6406021709966 is a wasteful number, since it uses less digits than its factorization.

6406021709966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138020203.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 6406021709966 in words is "six trillion, four hundred six billion, twenty-one million, seven hundred nine thousand, nine hundred sixty-six".