6566021774 has 16 divisors (see below), whose sum is σ = 10948801920. Its totient is φ = 2932714080.

The previous prime is 6566021771. The next prime is 6566021789. The reversal of 6566021774 is 4771206656.

It is a super-2 number, since 2×6566021774² = 86225283873284214152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566021771) 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 7 ways as a sum of consecutive naturals, for example, 4072409 + ... + 4074020.

It is an arithmetic number, because the mean of its divisors is an integer number (684300120).

Almost surely, 2^6566021774 is an apocalyptic number.

6566021774 is a deficient number, since it is larger than the sum of its proper divisors (4382780146).

6566021774 is a wasteful number, since it uses less digits than its factorization.

6566021774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8146475.

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 6566021774 is about 81030.9926756423. The cubic root of 6566021774 is about 1872.5529463229.

The spelling of 6566021774 in words is "six billion, five hundred sixty-six million, twenty-one thousand, seven hundred seventy-four".