6668793561 has 4 divisors (see below), whose sum is σ = 8891724752. Its totient is φ = 4445862372.

The previous prime is 6668793557. The next prime is 6668793583. The reversal of 6668793561 is 1653978666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6668793561 - 2² = 6668793557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668793661) 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, 1111465591 + ... + 1111465596.

It is an arithmetic number, because the mean of its divisors is an integer number (2222931188).

Almost surely, 2^6668793561 is an apocalyptic number.

It is an amenable number.

6668793561 is a deficient number, since it is larger than the sum of its proper divisors (2222931191).

6668793561 is a wasteful number, since it uses less digits than its factorization.

6668793561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222931190.

The product of its digits is 9797760, while the sum is 57.

The square root of 6668793561 is about 81662.6815687557. The cubic root of 6668793561 is about 1882.2721849008.

The spelling of 6668793561 in words is "six billion, six hundred sixty-eight million, seven hundred ninety-three thousand, five hundred sixty-one".