67679726545 has 12 divisors (see below), whose sum is σ = 86274089244. Its totient is φ = 50958851840.

The previous prime is 67679726537. The next prime is 67679726567. The reversal of 67679726545 is 54562797676.

67679726545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1669784769 + 66009941776 = 40863^2 + 256924^2 .

It is not a de Polignac number, because 67679726545 - 2³ = 67679726537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23417146 + ... + 23420035.

It is an arithmetic number, because the mean of its divisors is an integer number (7189507437).

Almost surely, 2^67679726545 is an apocalyptic number.

It is an amenable number.

67679726545 is a deficient number, since it is larger than the sum of its proper divisors (18594362699).

67679726545 is a wasteful number, since it uses less digits than its factorization.

67679726545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46837220 (or 46837203 counting only the distinct ones).

The product of its digits is 133358400, while the sum is 64.

The spelling of 67679726545 in words is "sixty-seven billion, six hundred seventy-nine million, seven hundred twenty-six thousand, five hundred forty-five".