18349915863878 has 8 divisors (see below), whose sum is σ = 27524891993400. Its totient is φ = 9174951866080.

The previous prime is 18349915863791. The next prime is 18349915863887. The reversal of 18349915863878 is 87836851994381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18349915863878² (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 3 ways as a sum of consecutive naturals, for example, 4164473 + ... + 7351371.

It is an arithmetic number, because the mean of its divisors is an integer number (3440611499175).

Almost surely, 2^{18349915863878} is an apocalyptic number.

18349915863878 is a deficient number, since it is larger than the sum of its proper divisors (9174976129522).

18349915863878 is a wasteful number, since it uses less digits than its factorization.

18349915863878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065862.

The product of its digits is 2508226560, while the sum is 80.

The spelling of 18349915863878 in words is "eighteen trillion, three hundred forty-nine billion, nine hundred fifteen million, eight hundred sixty-three thousand, eight hundred seventy-eight".