2668781657383 has 4 divisors (see below), whose sum is σ = 2692399194288. Its totient is φ = 2645164120480.

The previous prime is 2668781657357. The next prime is 2668781657419. The reversal of 2668781657383 is 3837561878662.

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 2668781657383 - 2²¹ = 2668779560231 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 (2668781657483) 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, 11808768283 + ... + 11808768508.

It is an arithmetic number, because the mean of its divisors is an integer number (673099798572).

Almost surely, 2^{2668781657383} is an apocalyptic number.

2668781657383 is a deficient number, since it is larger than the sum of its proper divisors (23617536905).

2668781657383 is a wasteful number, since it uses less digits than its factorization.

2668781657383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23617536904.

The product of its digits is 487710720, while the sum is 70.

The spelling of 2668781657383 in words is "two trillion, six hundred sixty-eight billion, seven hundred eighty-one million, six hundred fifty-seven thousand, three hundred eighty-three".