831421863918 has 12 divisors (see below), whose sum is σ = 1801414038528. Its totient is φ = 277140621300.

The previous prime is 831421863859. The next prime is 831421863931. The reversal of 831421863918 is 819368124138.

831421863918 is a `hidden beast` number, since 8 + 31 + 4 + 218 + 6 + 391 + 8 = 666.

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 5 ways as a sum of consecutive naturals, for example, 23095051758 + ... + 23095051793.

It is an arithmetic number, because the mean of its divisors is an integer number (150117836544).

Almost surely, 2^831421863918 is an apocalyptic number.

831421863918 is an abundant number, since it is smaller than the sum of its proper divisors (969992174610).

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

831421863918 is a wasteful number, since it uses less digits than its factorization.

831421863918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46190103559 (or 46190103556 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 831421863918 in words is "eight hundred thirty-one billion, four hundred twenty-one million, eight hundred sixty-three thousand, nine hundred eighteen".