68261774139 has 16 divisors (see below), whose sum is σ = 108907674400. Its totient is φ = 42007245408.

The previous prime is 68261774137. The next prime is 68261774153. The reversal of 68261774139 is 93147716286.

68261774139 is a `hidden beast` number, since 6 + 8 + 2 + 617 + 7 + 4 + 13 + 9 = 666.

It is not a de Polignac number, because 68261774139 - 2¹ = 68261774137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68261774137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97238644 + ... + 97239345.

It is an arithmetic number, because the mean of its divisors is an integer number (6806729650).

Almost surely, 2^68261774139 is an apocalyptic number.

68261774139 is a deficient number, since it is larger than the sum of its proper divisors (40645900261).

68261774139 is a wasteful number, since it uses less digits than its factorization.

68261774139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194478011 (or 194478005 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 68261774139 in words is "sixty-eight billion, two hundred sixty-one million, seven hundred seventy-four thousand, one hundred thirty-nine".