6537206813 has 4 divisors (see below), whose sum is σ = 6537433980. Its totient is φ = 6536979648.

The previous prime is 6537206807. The next prime is 6537206833. The reversal of 6537206813 is 3186027356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4380718969 + 2156487844 = 66187^2 + 46438^2 .

It is a cyclic number.

It is not a de Polignac number, because 6537206813 - 2⁶ = 6537206749 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 (6537206803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62870 + ... + 130487.

It is an arithmetic number, because the mean of its divisors is an integer number (1634358495).

Almost surely, 2^6537206813 is an apocalyptic number.

It is an amenable number.

6537206813 is a deficient number, since it is larger than the sum of its proper divisors (227167).

6537206813 is a wasteful number, since it uses less digits than its factorization.

6537206813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227166.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 6537206813 is about 80852.9950774862. The cubic root of 6537206813 is about 1869.8096990519.

The spelling of 6537206813 in words is "six billion, five hundred thirty-seven million, two hundred six thousand, eight hundred thirteen".