667743236513 has 4 divisors (see below), whose sum is σ = 696775551168. Its totient is φ = 638710921860.

The previous prime is 667743236509. The next prime is 667743236539. The reversal of 667743236513 is 315632347766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315632347766 = 2 ⋅157816173883.

It is a cyclic number.

It is not a de Polignac number, because 667743236513 - 2² = 667743236509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667743236543) 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, 14516157293 + ... + 14516157338.

It is an arithmetic number, because the mean of its divisors is an integer number (174193887792).

Almost surely, 2^667743236513 is an apocalyptic number.

It is an amenable number.

667743236513 is a deficient number, since it is larger than the sum of its proper divisors (29032314655).

667743236513 is a wasteful number, since it uses less digits than its factorization.

667743236513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29032314654.

The product of its digits is 11430720, while the sum is 53.

The spelling of 667743236513 in words is "six hundred sixty-seven billion, seven hundred forty-three million, two hundred thirty-six thousand, five hundred thirteen".