6599999956 has 24 divisors (see below), whose sum is σ = 12609868320. Its totient is φ = 2997650400.

The previous prime is 6599999951. The next prime is 6600000067.

It is a happy number.

6599999956 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6599999951) 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, 1291 + ... + 114898.

It is an arithmetic number, because the mean of its divisors is an integer number (525411180).

Almost surely, 2^6599999956 is an apocalyptic number.

It is an amenable number.

6599999956 is a deficient number, since it is larger than the sum of its proper divisors (6009868364).

6599999956 is a wasteful number, since it uses less digits than its factorization.

6599999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117495 (or 117493 counting only the distinct ones).

The product of its digits is 478296900, while the sum is 76.

The square root of 6599999956 is about 81240.3837755583. The cubic root of 6599999956 is about 1875.7774511985. Note that the first 3 decimals are identical.

The spelling of 6599999956 in words is "six billion, five hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".