6642618793 has 4 divisors (see below), whose sum is σ = 6657960148. Its totient is φ = 6627277440.

The previous prime is 6642618791. The next prime is 6642618821. The reversal of 6642618793 is 3978162466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3978162466 = 2 ⋅1989081233.

It can be written as a sum of positive squares in 2 ways, for example, as 870722064 + 5771896729 = 29508^2 + 75973^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642618793 - 2¹ = 6642618791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6642618793.

It is not an unprimeable number, because it can be changed into a prime (6642618791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7670028 + ... + 7670893.

It is an arithmetic number, because the mean of its divisors is an integer number (1664490037).

Almost surely, 2^6642618793 is an apocalyptic number.

It is an amenable number.

6642618793 is a deficient number, since it is larger than the sum of its proper divisors (15341355).

6642618793 is a wasteful number, since it uses less digits than its factorization.

6642618793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15341354.

The product of its digits is 2612736, while the sum is 52.

The square root of 6642618793 is about 81502.2625023379. The cubic root of 6642618793 is about 1879.8063397355.

The spelling of 6642618793 in words is "six billion, six hundred forty-two million, six hundred eighteen thousand, seven hundred ninety-three".