671904815918 has 48 divisors (see below), whose sum is σ = 1238119344000. Its totient is φ = 272120620464.

The previous prime is 671904815893. The next prime is 671904815929. The reversal of 671904815918 is 819518409176.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1608668 + ... + 1982831.

It is an arithmetic number, because the mean of its divisors is an integer number (25794153000).

Almost surely, 2^671904815918 is an apocalyptic number.

671904815918 is a deficient number, since it is larger than the sum of its proper divisors (566214528082).

671904815918 is a wasteful number, since it uses less digits than its factorization.

671904815918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591621 (or 3591614 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 59.

The spelling of 671904815918 in words is "six hundred seventy-one billion, nine hundred four million, eight hundred fifteen thousand, nine hundred eighteen".