6243557993 has 8 divisors (see below), whose sum is σ = 6432841800. Its totient is φ = 6056921728.

The previous prime is 6243557981. The next prime is 6243558017. The reversal of 6243557993 is 3997553426.

It can be written as a sum of positive squares in 4 ways, for example, as 1513832464 + 4729725529 = 38908^2 + 68773^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6243557993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6243557923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657098 + ... + 666531.

It is an arithmetic number, because the mean of its divisors is an integer number (804105225).

Almost surely, 2^6243557993 is an apocalyptic number.

It is an amenable number.

6243557993 is a deficient number, since it is larger than the sum of its proper divisors (189283807).

6243557993 is a wasteful number, since it uses less digits than its factorization.

6243557993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323771.

The product of its digits is 6123600, while the sum is 53.

The square root of 6243557993 is about 79016.1881705262. The cubic root of 6243557993 is about 1841.3826635800.

The spelling of 6243557993 in words is "six billion, two hundred forty-three million, five hundred fifty-seven thousand, nine hundred ninety-three".