67826626561 has 4 divisors (see below), whose sum is σ = 68448889300. Its totient is φ = 67204363824.

The previous prime is 67826626477. The next prime is 67826626601. The reversal of 67826626561 is 16562662876.

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 62078712336 + 5747914225 = 249156^2 + 75815^2 .

It is a cyclic number.

It is not a de Polignac number, because 67826626561 - 2¹¹ = 67826624513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67826626661) 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, 311131206 + ... + 311131423.

It is an arithmetic number, because the mean of its divisors is an integer number (17112222325).

Almost surely, 2^67826626561 is an apocalyptic number.

It is an amenable number.

67826626561 is a deficient number, since it is larger than the sum of its proper divisors (622262739).

67826626561 is a wasteful number, since it uses less digits than its factorization.

67826626561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622262738.

The product of its digits is 8709120, while the sum is 55.

It can be divided in two parts, 67 and 826626561, that added together give a palindrome (826626628).

The spelling of 67826626561 in words is "sixty-seven billion, eight hundred twenty-six million, six hundred twenty-six thousand, five hundred sixty-one".