66664895983 has 16 divisors (see below), whose sum is σ = 76339598400. Its totient is φ = 57028089600.

The previous prime is 66664895959. The next prime is 66664895989. The reversal of 66664895983 is 38959846666.

It is a cyclic number.

It is not a de Polignac number, because 66664895983 - 2¹³ = 66664887791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664895989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10379113 + ... + 10385533.

It is an arithmetic number, because the mean of its divisors is an integer number (4771224900).

Almost surely, 2^66664895983 is an apocalyptic number.

66664895983 is a deficient number, since it is larger than the sum of its proper divisors (9674702417).

66664895983 is a wasteful number, since it uses less digits than its factorization.

66664895983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9138.

The product of its digits is 403107840, while the sum is 70.

The spelling of 66664895983 in words is "sixty-six billion, six hundred sixty-four million, eight hundred ninety-five thousand, nine hundred eighty-three".