6506428993 has 2 divisors, whose sum is σ = 6506428994. Its totient is φ = 6506428992.

The previous prime is 6506428891. The next prime is 6506428997. The reversal of 6506428993 is 3998246056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6333453889 + 172975104 = 79583^2 + 13152^2 .

It is a cyclic number.

It is not a de Polignac number, because 6506428993 - 2¹³ = 6506420801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6506428993.

It is not a weakly prime, because it can be changed into another prime (6506428997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253214496 + 3253214497.

It is an arithmetic number, because the mean of its divisors is an integer number (3253214497).

Almost surely, 2^6506428993 is an apocalyptic number.

It is an amenable number.

6506428993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506428993 is an equidigital number, since it uses as much as digits as its factorization.

6506428993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The square root of 6506428993 is about 80662.4385510381. The cubic root of 6506428993 is about 1866.8706651025.

The spelling of 6506428993 in words is "six billion, five hundred six million, four hundred twenty-eight thousand, nine hundred ninety-three".