18315779647896 has 96 divisors (see below), whose sum is σ = 50451044529600. Its totient is φ = 6002031572160.

The previous prime is 18315779647871. The next prime is 18315779647901. The reversal of 18315779647896 is 69874697751381.

18315779647896 is a `hidden beast` number, since 1 + 8 + 3 + 1 + 57 + 7 + 9 + 6 + 478 + 96 = 666.

It is a super-2 number, since 2×18315779647896² (a number of 27 digits) contains 22 as substring.

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, 8064966 + ... + 10083413.

It is an arithmetic number, because the mean of its divisors is an integer number (525531713850).

Almost surely, 2^{18315779647896} is an apocalyptic number.

It is an amenable number.

18315779647896 is an abundant number, since it is smaller than the sum of its proper divisors (32135264881704).

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

18315779647896 is a wasteful number, since it uses less digits than its factorization.

18315779647896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18148629 (or 18148622 counting only the distinct ones).

The product of its digits is 3840721920, while the sum is 81.

The spelling of 18315779647896 in words is "eighteen trillion, three hundred fifteen billion, seven hundred seventy-nine million, six hundred forty-seven thousand, eight hundred ninety-six".