66916436532664 has 8 divisors (see below), whose sum is σ = 125468318498760. Its totient is φ = 33458218266328.

The previous prime is 66916436532661. The next prime is 66916436532719. The reversal of 66916436532664 is 46623563461966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66916436532664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66916436532661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182277283284 + ... + 4182277283299.

It is an arithmetic number, because the mean of its divisors is an integer number (15683539812345).

Almost surely, 2^{66916436532664} is an apocalyptic number.

It is an amenable number.

66916436532664 is a deficient number, since it is larger than the sum of its proper divisors (58551881966096).

66916436532664 is a wasteful number, since it uses less digits than its factorization.

66916436532664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364554566589 (or 8364554566585 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 67.

The spelling of 66916436532664 in words is "sixty-six trillion, nine hundred sixteen billion, four hundred thirty-six million, five hundred thirty-two thousand, six hundred sixty-four".