6668157068791 has 4 divisors (see below), whose sum is σ = 6668348480872. Its totient is φ = 6667965656712.

The previous prime is 6668157068789. The next prime is 6668157068827. The reversal of 6668157068791 is 1978607518666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6668157068791 - 2¹ = 6668157068789 is a prime.

It is a super-2 number, since 2×6668157068791² (a number of 26 digits) contains 22 as substring.

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 6668157068791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668157068731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95653776 + ... + 95723461.

It is an arithmetic number, because the mean of its divisors is an integer number (1667087120218).

Almost surely, 2^{6668157068791} is an apocalyptic number.

6668157068791 is a deficient number, since it is larger than the sum of its proper divisors (191412081).

6668157068791 is a wasteful number, since it uses less digits than its factorization.

6668157068791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191412080.

The product of its (nonzero) digits is 182891520, while the sum is 70.

The spelling of 6668157068791 in words is "six trillion, six hundred sixty-eight billion, one hundred fifty-seven million, sixty-eight thousand, seven hundred ninety-one".