667726384655 has 16 divisors (see below), whose sum is σ = 874139019264. Its totient is φ = 485605589280.

The previous prime is 667726384627. The next prime is 667726384691. The reversal of 667726384655 is 556483627766.

It is a de Polignac number, because none of the positive numbers 2^k-667726384655 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667726384591 and 667726384600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080142 + ... + 2379588.

It is an arithmetic number, because the mean of its divisors is an integer number (54633688704).

Almost surely, 2^667726384655 is an apocalyptic number.

667726384655 is a deficient number, since it is larger than the sum of its proper divisors (206412634609).

667726384655 is a wasteful number, since it uses less digits than its factorization.

667726384655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340006.

The product of its digits is 304819200, while the sum is 65.

The spelling of 667726384655 in words is "six hundred sixty-seven billion, seven hundred twenty-six million, three hundred eighty-four thousand, six hundred fifty-five".