68861581385 has 16 divisors (see below), whose sum is σ = 85333827072. Its totient is φ = 53290742400.

The previous prime is 68861581361. The next prime is 68861581387. The reversal of 68861581385 is 58318516886.

It is a de Polignac number, because none of the positive numbers 2^k-68861581385 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68861581387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302642 + ... + 478868.

It is an arithmetic number, because the mean of its divisors is an integer number (5333364192).

Almost surely, 2^68861581385 is an apocalyptic number.

It is an amenable number.

68861581385 is a deficient number, since it is larger than the sum of its proper divisors (16472245687).

68861581385 is a wasteful number, since it uses less digits than its factorization.

68861581385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178784.

The product of its digits is 11059200, while the sum is 59.

The spelling of 68861581385 in words is "sixty-eight billion, eight hundred sixty-one million, five hundred eighty-one thousand, three hundred eighty-five".