6426191493 has 12 divisors (see below), whose sum is σ = 9322117740. Its totient is φ = 4265739456.

The previous prime is 6426191483. The next prime is 6426191501. The reversal of 6426191493 is 3941916246.

It can be written as a sum of positive squares in 2 ways, for example, as 626150529 + 5800040964 = 25023^2 + 76158^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6426191493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6426191423) 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 11 ways as a sum of consecutive naturals, for example, 1530138 + ... + 1534331.

It is an arithmetic number, because the mean of its divisors is an integer number (776843145).

Almost surely, 2^6426191493 is an apocalyptic number.

It is an amenable number.

6426191493 is a deficient number, since it is larger than the sum of its proper divisors (2895926247).

6426191493 is a wasteful number, since it uses less digits than its factorization.

6426191493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064708 (or 3064705 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 6426191493 is about 80163.5296939949. The cubic root of 6426191493 is about 1859.1647975855.

The spelling of 6426191493 in words is "six billion, four hundred twenty-six million, one hundred ninety-one thousand, four hundred ninety-three".