813984997518 has 96 divisors (see below), whose sum is σ = 2294417428992. Its totient is φ = 202232289600.

The previous prime is 813984997517. The next prime is 813984997523. The reversal of 813984997518 is 815799489318.

It is a happy number.

813984997518 is a `hidden beast` number, since 8 + 13 + 9 + 8 + 4 + 9 + 97 + 518 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813984997517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12735313 + ... + 12799068.

It is an arithmetic number, because the mean of its divisors is an integer number (23900181552).

Almost surely, 2^813984997518 is an apocalyptic number.

813984997518 is an abundant number, since it is smaller than the sum of its proper divisors (1480432431474).

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

813984997518 is a wasteful number, since it uses less digits than its factorization.

813984997518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25534430 (or 25534427 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 72.

The spelling of 813984997518 in words is "eight hundred thirteen billion, nine hundred eighty-four million, nine hundred ninety-seven thousand, five hundred eighteen".