18257329881 has 192 divisors, whose sum is σ = 34332672000. Its totient is φ = 9577800288.

The previous prime is 18257329879. The next prime is 18257329897. The reversal of 18257329881 is 18892375281.

It is not a de Polignac number, because 18257329881 - 2¹ = 18257329879 is a prime.

It is a super-4 number, since 4×18257329881⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18257329841) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 143758440 + ... + 143758566.

It is an arithmetic number, because the mean of its divisors is an integer number (178816000).

Almost surely, 2^18257329881 is an apocalyptic number.

It is an amenable number.

18257329881 is a deficient number, since it is larger than the sum of its proper divisors (16075342119).

18257329881 is a wasteful number, since it uses less digits than its factorization.

18257329881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 199 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 18257329881 in words is "eighteen billion, two hundred fifty-seven million, three hundred twenty-nine thousand, eight hundred eighty-one".