2667428673891 has 4 divisors (see below), whose sum is σ = 3556571565192. Its totient is φ = 1778285782592.

The previous prime is 2667428673881. The next prime is 2667428673911. The reversal of 2667428673891 is 1983768247662.

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 2667428673891 - 2³³ = 2658838739299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2667428673881) 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, 444571445646 + ... + 444571445651.

It is an arithmetic number, because the mean of its divisors is an integer number (889142891298).

Almost surely, 2^{2667428673891} is an apocalyptic number.

2667428673891 is a deficient number, since it is larger than the sum of its proper divisors (889142891301).

2667428673891 is an equidigital number, since it uses as much as digits as its factorization.

2667428673891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889142891300.

The product of its digits is 292626432, while the sum is 69.

The spelling of 2667428673891 in words is "two trillion, six hundred sixty-seven billion, four hundred twenty-eight million, six hundred seventy-three thousand, eight hundred ninety-one".