1378942166187 has 36 divisors (see below), whose sum is σ = 2074438086840. Its totient is φ = 905305482576.

The previous prime is 1378942166183. The next prime is 1378942166209. The reversal of 1378942166187 is 7816612498731.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1378942166187 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 9 + 4 + 2 + 1 + 6 + 618 + 7 = 666.

It is not a de Polignac number, because 1378942166187 - 2² = 1378942166183 is a prime.

It is a super-2 number, since 2×1378942166187² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378942166183) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 408816033 + ... + 408819405.

It is an arithmetic number, because the mean of its divisors is an integer number (57623280190).

Almost surely, 2^{1378942166187} is an apocalyptic number.

1378942166187 is a deficient number, since it is larger than the sum of its proper divisors (695495920653).

1378942166187 is an frugal number, since it uses more digits than its factorization.

1378942166187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889 (or 3443 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 1378942166187 in words is "one trillion, three hundred seventy-eight billion, nine hundred forty-two million, one hundred sixty-six thousand, one hundred eighty-seven".