6447955199 has 4 divisors (see below), whose sum is σ = 7369091664. Its totient is φ = 5526818736.

The previous prime is 6447955093. The next prime is 6447955201. The reversal of 6447955199 is 9915597446.

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

It is a cyclic number.

It is not a de Polignac number, because 6447955199 - 2¹⁶ = 6447889663 is a prime.

It is a super-2 number, since 2×6447955199² = 83152252496622259202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447954199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460568222 + ... + 460568235.

It is an arithmetic number, because the mean of its divisors is an integer number (1842272916).

Almost surely, 2^6447955199 is an apocalyptic number.

6447955199 is a deficient number, since it is larger than the sum of its proper divisors (921136465).

6447955199 is an equidigital number, since it uses as much as digits as its factorization.

6447955199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921136464.

The product of its digits is 12247200, while the sum is 59.

The square root of 6447955199 is about 80299.1606369581. The cubic root of 6447955199 is about 1861.2612556866.

The spelling of 6447955199 in words is "six billion, four hundred forty-seven million, nine hundred fifty-five thousand, one hundred ninety-nine".