6642574847 has 4 divisors (see below), whose sum is σ = 6644707680. Its totient is φ = 6640442016.

The previous prime is 6642574837. The next prime is 6642574867. The reversal of 6642574847 is 7484752466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7484752466 = 2 ⋅3742376233.

It is a cyclic number.

It is not a de Polignac number, because 6642574847 - 2¹² = 6642570751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642574837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061738 + ... + 1067975.

It is an arithmetic number, because the mean of its divisors is an integer number (1661176920).

Almost surely, 2^6642574847 is an apocalyptic number.

6642574847 is a deficient number, since it is larger than the sum of its proper divisors (2132833).

6642574847 is a wasteful number, since it uses less digits than its factorization.

6642574847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132832.

The product of its digits is 9031680, while the sum is 53.

The square root of 6642574847 is about 81501.9929020144. The cubic root of 6642574847 is about 1879.8021942745.

The spelling of 6642574847 in words is "six billion, six hundred forty-two million, five hundred seventy-four thousand, eight hundred forty-seven".