6991449836 has 24 divisors (see below), whose sum is σ = 14718842880. Its totient is φ = 2838633552.

The previous prime is 6991449743. The next prime is 6991449887. The reversal of 6991449836 is 6389441996.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6570380 + ... + 6571443.

It is an arithmetic number, because the mean of its divisors is an integer number (613285120).

Almost surely, 2^6991449836 is an apocalyptic number.

It is an amenable number.

6991449836 is an abundant number, since it is smaller than the sum of its proper divisors (7727393044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6991449836 is a wasteful number, since it uses less digits than its factorization.

6991449836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13141853 (or 13141851 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 59.

The square root of 6991449836 is about 83614.8900376004. The cubic root of 6991449836 is about 1912.1520142409.

The spelling of 6991449836 in words is "six billion, nine hundred ninety-one million, four hundred forty-nine thousand, eight hundred thirty-six".