18215973502993 has 16 divisors (see below), whose sum is σ = 21835823998464. Its totient is φ = 14868472242240.

The previous prime is 18215973502891. The next prime is 18215973503027. The reversal of 18215973502993 is 39920537951281.

It is a cyclic number.

It is not a de Polignac number, because 18215973502993 - 2¹³ = 18215973494801 is a prime.

It is a super-3 number, since 3×18215973502993³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18215973502393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748199998 + ... + 748224343.

It is an arithmetic number, because the mean of its divisors is an integer number (1364738999904).

Almost surely, 2^{18215973502993} is an apocalyptic number.

It is an amenable number.

18215973502993 is a deficient number, since it is larger than the sum of its proper divisors (3619850495471).

18215973502993 is a wasteful number, since it uses less digits than its factorization.

18215973502993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496424432.

The product of its (nonzero) digits is 36741600, while the sum is 64.

The spelling of 18215973502993 in words is "eighteen trillion, two hundred fifteen billion, nine hundred seventy-three million, five hundred two thousand, nine hundred ninety-three".