18637978661127 has 12 divisors (see below), whose sum is σ = 30767456837520. Its totient is φ = 10650273520608.

The previous prime is 18637978661123. The next prime is 18637978661143. The reversal of 18637978661127 is 72116687973681.

18637978661127 is a `hidden beast` number, since 1 + 8 + 6 + 379 + 78 + 6 + 61 + 127 = 666.

It is not a de Polignac number, because 18637978661127 - 2² = 18637978661123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18637978661123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147920465502 + ... + 147920465627.

It is an arithmetic number, because the mean of its divisors is an integer number (2563954736460).

Almost surely, 2^{18637978661127} is an apocalyptic number.

18637978661127 is a deficient number, since it is larger than the sum of its proper divisors (12129478176393).

18637978661127 is a wasteful number, since it uses less digits than its factorization.

18637978661127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295840931142 (or 295840931139 counting only the distinct ones).

The product of its digits is 256048128, while the sum is 72.

The spelling of 18637978661127 in words is "eighteen trillion, six hundred thirty-seven billion, nine hundred seventy-eight million, six hundred sixty-one thousand, one hundred twenty-seven".