68061556417 has 4 divisors (see below), whose sum is σ = 68063004100. Its totient is φ = 68060108736.

The previous prime is 68061556361. The next prime is 68061556427. The reversal of 68061556417 is 71465516086.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48604375296 + 19457181121 = 220464^2 + 139489^2 .

It is a cyclic number.

It is not a de Polignac number, because 68061556417 - 2⁷ = 68061556289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68061556427) 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, 650868 + ... + 748165.

It is an arithmetic number, because the mean of its divisors is an integer number (17015751025).

Almost surely, 2^68061556417 is an apocalyptic number.

It is an amenable number.

68061556417 is a deficient number, since it is larger than the sum of its proper divisors (1447683).

68061556417 is a wasteful number, since it uses less digits than its factorization.

68061556417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447682.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 68061556417 in words is "sixty-eight billion, sixty-one million, five hundred fifty-six thousand, four hundred seventeen".