68838191892 has 18 divisors (see below), whose sum is σ = 174007651818. Its totient is φ = 22946063952.

The previous prime is 68838191879. The next prime is 68838191893. The reversal of 68838191892 is 29819183886.

It is a happy number.

68838191892 is a `hidden beast` number, since 6 + 88 + 381 + 91 + 8 + 92 = 666.

It can be written as a sum of positive squares in only one way, i.e., 67977004176 + 861187716 = 260724^2 + 29346^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68838191893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 956085963 + ... + 956086034.

Almost surely, 2^68838191892 is an apocalyptic number.

It is an amenable number.

68838191892 is an abundant number, since it is smaller than the sum of its proper divisors (105169459926).

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

68838191892 is a wasteful number, since it uses less digits than its factorization.

68838191892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912172007 (or 1912172002 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The spelling of 68838191892 in words is "sixty-eight billion, eight hundred thirty-eight million, one hundred ninety-one thousand, eight hundred ninety-two".