6566198774 has 16 divisors (see below), whose sum is σ = 9873916416. Its totient is φ = 3274905000.

The previous prime is 6566198773. The next prime is 6566198797. The reversal of 6566198774 is 4778916656.

It is a super-2 number, since 2×6566198774² = 86229932679358206152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566198773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1636679 + ... + 1640685.

It is an arithmetic number, because the mean of its divisors is an integer number (617119776).

Almost surely, 2^6566198774 is an apocalyptic number.

6566198774 is a deficient number, since it is larger than the sum of its proper divisors (3307717642).

6566198774 is a wasteful number, since it uses less digits than its factorization.

6566198774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851.

The product of its digits is 15240960, while the sum is 59.

The square root of 6566198774 is about 81032.0848429806. The cubic root of 6566198774 is about 1872.5697722847.

The spelling of 6566198774 in words is "six billion, five hundred sixty-six million, one hundred ninety-eight thousand, seven hundred seventy-four".