667631964334 has 4 divisors (see below), whose sum is σ = 1001447946504. Its totient is φ = 333815982166.

The previous prime is 667631964289. The next prime is 667631964343. The reversal of 667631964334 is 433469136766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 433469136766 = 2 ⋅216734568383.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166907991082 + ... + 166907991085.

It is an arithmetic number, because the mean of its divisors is an integer number (250361986626).

Almost surely, 2^667631964334 is an apocalyptic number.

667631964334 is a deficient number, since it is larger than the sum of its proper divisors (333815982170).

667631964334 is a wasteful number, since it uses less digits than its factorization.

667631964334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333815982169.

The product of its digits is 35271936, while the sum is 58.

The spelling of 667631964334 in words is "six hundred sixty-seven billion, six hundred thirty-one million, nine hundred sixty-four thousand, three hundred thirty-four".