6436005993 has 6 divisors (see below), whose sum is σ = 9296453114. Its totient is φ = 4290670656.

The previous prime is 6436005991. The next prime is 6436006009. The reversal of 6436005993 is 3995006346.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4378204224 + 2057801769 = 66168^2 + 45363^2 .

It is not a de Polignac number, because 6436005993 - 2¹ = 6436005991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6436005991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 357555880 + ... + 357555897.

Almost surely, 2^6436005993 is an apocalyptic number.

It is an amenable number.

6436005993 is a deficient number, since it is larger than the sum of its proper divisors (2860447121).

6436005993 is a wasteful number, since it uses less digits than its factorization.

6436005993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715111783 (or 715111780 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 45.

The square root of 6436005993 is about 80224.7218318643. The cubic root of 6436005993 is about 1860.1107955159.

The spelling of 6436005993 in words is "six billion, four hundred thirty-six million, five thousand, nine hundred ninety-three".