667743722056 has 64 divisors (see below), whose sum is σ = 1343176084800. Its totient is φ = 310240569600.

The previous prime is 667743722039. The next prime is 667743722059. The reversal of 667743722056 is 650227347766.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 667743721988 and 667743722006.

It is not an unprimeable number, because it can be changed into a prime (667743722059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32946966 + ... + 32967226.

It is an arithmetic number, because the mean of its divisors is an integer number (20987126325).

Almost surely, 2^667743722056 is an apocalyptic number.

It is an amenable number.

667743722056 is an abundant number, since it is smaller than the sum of its proper divisors (675432362744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667743722056 is a wasteful number, since it uses less digits than its factorization.

667743722056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24430 (or 24426 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 55.

The spelling of 667743722056 in words is "six hundred sixty-seven billion, seven hundred forty-three million, seven hundred twenty-two thousand, fifty-six".