667728478443 has 8 divisors (see below), whose sum is σ = 958789610128. Its totient is φ = 410909832864.

The previous prime is 667728478433. The next prime is 667728478499. The reversal of 667728478443 is 344874827766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667728478443 - 2⁸ = 667728478187 is a prime.

It is a super-2 number, since 2×667728478443² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667728478433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8560621480 + ... + 8560621557.

It is an arithmetic number, because the mean of its divisors is an integer number (119848701266).

Almost surely, 2^667728478443 is an apocalyptic number.

667728478443 is a deficient number, since it is larger than the sum of its proper divisors (291061131685).

667728478443 is a wasteful number, since it uses less digits than its factorization.

667728478443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17121243053.

The product of its digits is 303464448, while the sum is 66.

The spelling of 667728478443 in words is "six hundred sixty-seven billion, seven hundred twenty-eight million, four hundred seventy-eight thousand, four hundred forty-three".