1668156750138 has 8 divisors (see below), whose sum is σ = 3336313500288. Its totient is φ = 556052250044.

The previous prime is 1668156750131. The next prime is 1668156750229. The reversal of 1668156750138 is 8310576518661.

It is a sphenic number, since it is the product of 3 distinct primes.

1668156750138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1668156750131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139013062506 + ... + 139013062517.

It is an arithmetic number, because the mean of its divisors is an integer number (417039187536).

Almost surely, 2^{1668156750138} is an apocalyptic number.

1668156750138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1668156750138 is a wasteful number, since it uses less digits than its factorization.

1668156750138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278026125028.

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 1668156750138 in words is "one trillion, six hundred sixty-eight billion, one hundred fifty-six million, seven hundred fifty thousand, one hundred thirty-eight".