56668889999 has 4 divisors (see below), whose sum is σ = 57629379720. Its totient is φ = 55708400280.

The previous prime is 56668889993. The next prime is 56668890079. The reversal of 56668889999 is 99998886665.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56668889999 is a prime.

It is a super-2 number, since 2×56668889999² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56668889993) 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, 480244772 + ... + 480244889.

It is an arithmetic number, because the mean of its divisors is an integer number (14407344930).

Almost surely, 2^56668889999 is an apocalyptic number.

56668889999 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

56668889999 is a deficient number, since it is larger than the sum of its proper divisors (960489721).

56668889999 is an equidigital number, since it uses as much as digits as its factorization.

56668889999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960489720.

The product of its digits is 3627970560, while the sum is 83.

The spelling of 56668889999 in words is "fifty-six billion, six hundred sixty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-nine".