18129906388 has 48 divisors (see below), whose sum is σ = 34801643520. Its totient is φ = 8195765600.

The previous prime is 18129906341. The next prime is 18129906491. The reversal of 18129906388 is 88360992181.

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, 6806745 + ... + 6809407.

It is an arithmetic number, because the mean of its divisors is an integer number (725034240).

Almost surely, 2^18129906388 is an apocalyptic number.

It is an amenable number.

18129906388 is a deficient number, since it is larger than the sum of its proper divisors (16671737132).

18129906388 is a wasteful number, since it uses less digits than its factorization.

18129906388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468 (or 3466 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 18129906388 in words is "eighteen billion, one hundred twenty-nine million, nine hundred six thousand, three hundred eighty-eight".