6991904458 has 32 divisors (see below), whose sum is σ = 13644288000. Its totient is φ = 2605677360.

The previous prime is 6991904419. The next prime is 6991904473. The reversal of 6991904458 is 8544091996.

It is a junction number, because it is equal to n+sod(n) for n = 6991904399 and 6991904408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983458 + ... + 990541.

It is an arithmetic number, because the mean of its divisors is an integer number (426384000).

Almost surely, 2^6991904458 is an apocalyptic number.

6991904458 is a deficient number, since it is larger than the sum of its proper divisors (6652383542).

6991904458 is a wasteful number, since it uses less digits than its factorization.

6991904458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974042.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 6991904458 is about 83617.6085403069. The cubic root of 6991904458 is about 1912.1934595086.

The spelling of 6991904458 in words is "six billion, nine hundred ninety-one million, nine hundred four thousand, four hundred fifty-eight".