67645726849 has 4 divisors (see below), whose sum is σ = 67667916100. Its totient is φ = 67623537600.

The previous prime is 67645726807. The next prime is 67645726853. The reversal of 67645726849 is 94862754676.

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 2076442624 + 65569284225 = 45568^2 + 256065^2 .

It is a cyclic number.

It is not a de Polignac number, because 67645726849 - 2³¹ = 65498243201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67645726879) 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, 11090052 + ... + 11096149.

It is an arithmetic number, because the mean of its divisors is an integer number (16916979025).

Almost surely, 2^67645726849 is an apocalyptic number.

It is an amenable number.

67645726849 is a deficient number, since it is larger than the sum of its proper divisors (22189251).

67645726849 is a wasteful number, since it uses less digits than its factorization.

67645726849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22189250.

The product of its digits is 121927680, while the sum is 64.

The spelling of 67645726849 in words is "sixty-seven billion, six hundred forty-five million, seven hundred twenty-six thousand, eight hundred forty-nine".