1966158053838 has 24 divisors (see below), whose sum is σ = 4647282673176. Its totient is φ = 595805470800.

The previous prime is 1966158053813. The next prime is 1966158053879. The reversal of 1966158053838 is 8383508516691.

1966158053838 is a `hidden beast` number, since 1 + 9 + 6 + 6 + 15 + 80 + 538 + 3 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4965045393 + ... + 4965045788.

It is an arithmetic number, because the mean of its divisors is an integer number (193636778049).

Almost surely, 2^{1966158053838} is an apocalyptic number.

1966158053838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1966158053838 is an abundant number, since it is smaller than the sum of its proper divisors (2681124619338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1966158053838 is a wasteful number, since it uses less digits than its factorization.

1966158053838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9930091200 (or 9930091197 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 1966158053838 in words is "one trillion, nine hundred sixty-six billion, one hundred fifty-eight million, fifty-three thousand, eight hundred thirty-eight".