66664447475 has 6 divisors (see below), whose sum is σ = 82663914900. Its totient is φ = 53331557960.

The previous prime is 66664447429. The next prime is 66664447477. The reversal of 66664447475 is 57474446666.

It is a happy number.

It is not a de Polignac number, because 66664447475 - 2¹⁸ = 66664185331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66664447477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333288925 + ... + 1333288974.

It is an arithmetic number, because the mean of its divisors is an integer number (13777319150).

Almost surely, 2^66664447475 is an apocalyptic number.

66664447475 is a deficient number, since it is larger than the sum of its proper divisors (15999467425).

66664447475 is a wasteful number, since it uses less digits than its factorization.

66664447475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666577909 (or 2666577904 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 59.

The spelling of 66664447475 in words is "sixty-six billion, six hundred sixty-four million, four hundred forty-seven thousand, four hundred seventy-five".