6642093791 has 2 divisors, whose sum is σ = 6642093792. Its totient is φ = 6642093790.

The previous prime is 6642093781. The next prime is 6642093797. The reversal of 6642093791 is 1973902466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6642093791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642093797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321046895 + 3321046896.

It is an arithmetic number, because the mean of its divisors is an integer number (3321046896).

Almost surely, 2^6642093791 is an apocalyptic number.

6642093791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642093791 is an equidigital number, since it uses as much as digits as its factorization.

6642093791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 6642093791 is about 81499.0416569422. The cubic root of 6642093791 is about 1879.7568146852.

The spelling of 6642093791 in words is "six billion, six hundred forty-two million, ninety-three thousand, seven hundred ninety-one".