18871823135 has 16 divisors (see below), whose sum is σ = 24755283072. Its totient is φ = 13696989600.

The previous prime is 18871823077. The next prime is 18871823141. The reversal of 18871823135 is 53132817881.

It is a happy number.

It is not a de Polignac number, because 18871823135 - 2¹⁶ = 18871757599 is a prime.

It is a super-2 number, since 2×18871823135² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18871823135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322409 + ... + 376418.

It is an arithmetic number, because the mean of its divisors is an integer number (1547205192).

Almost surely, 2^18871823135 is an apocalyptic number.

18871823135 is a deficient number, since it is larger than the sum of its proper divisors (5883459937).

18871823135 is a wasteful number, since it uses less digits than its factorization.

18871823135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699334.

The product of its digits is 322560, while the sum is 47.

The spelling of 18871823135 in words is "eighteen billion, eight hundred seventy-one million, eight hundred twenty-three thousand, one hundred thirty-five".