67649516393 has 4 divisors (see below), whose sum is σ = 67653280068. Its totient is φ = 67645752720.

The previous prime is 67649516387. The next prime is 67649516399. The reversal of 67649516393 is 39361594676.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (67649516387) and next prime (67649516399).

It can be written as a sum of positive squares in 2 ways, for example, as 60011280784 + 7638235609 = 244972^2 + 87397^2 .

It is a cyclic number.

It is not a de Polignac number, because 67649516393 - 2¹² = 67649512297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67649516399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1854746 + ... + 1890867.

It is an arithmetic number, because the mean of its divisors is an integer number (16913320017).

Almost surely, 2^67649516393 is an apocalyptic number.

It is an amenable number.

67649516393 is a deficient number, since it is larger than the sum of its proper divisors (3763675).

67649516393 is a wasteful number, since it uses less digits than its factorization.

67649516393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763674.

The product of its digits is 22044960, while the sum is 59.

The spelling of 67649516393 in words is "sixty-seven billion, six hundred forty-nine million, five hundred sixteen thousand, three hundred ninety-three".