6815919903 has 12 divisors (see below), whose sum is σ = 9840737160. Its totient is φ = 4194411936.

The previous prime is 6815919899. The next prime is 6815919917. The reversal of 6815919903 is 3099195186.

It is a happy number.

It is not a de Polignac number, because 6815919903 - 2² = 6815919899 is a prime.

It is a super-2 number, since 2×6815919903² = 92913528248223058818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6815419903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6721308 + ... + 6722321.

It is an arithmetic number, because the mean of its divisors is an integer number (820061430).

Almost surely, 2^6815919903 is an apocalyptic number.

6815919903 is a deficient number, since it is larger than the sum of its proper divisors (3024817257).

6815919903 is a wasteful number, since it uses less digits than its factorization.

6815919903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13443658 (or 13443645 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 51.

The square root of 6815919903 is about 82558.5846717348. The cubic root of 6815919903 is about 1896.0137944861.

The spelling of 6815919903 in words is "six billion, eight hundred fifteen million, nine hundred nineteen thousand, nine hundred three".