68705281511 has 4 divisors (see below), whose sum is σ = 68716828752. Its totient is φ = 68693734272.

The previous prime is 68705281507. The next prime is 68705281577. The reversal of 68705281511 is 11518250786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68705281511 - 2² = 68705281507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68705283511) 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, 5764691 + ... + 5776596.

It is an arithmetic number, because the mean of its divisors is an integer number (17179207188).

Almost surely, 2^68705281511 is an apocalyptic number.

68705281511 is a deficient number, since it is larger than the sum of its proper divisors (11547241).

68705281511 is a wasteful number, since it uses less digits than its factorization.

68705281511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11547240.

The product of its (nonzero) digits is 134400, while the sum is 44.

The spelling of 68705281511 in words is "sixty-eight billion, seven hundred five million, two hundred eighty-one thousand, five hundred eleven".