66414675566 has 4 divisors (see below), whose sum is σ = 99622013352. Its totient is φ = 33207337782.

The previous prime is 66414675563. The next prime is 66414675581. The reversal of 66414675566 is 66557641466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66414675563) by changing a digit.

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, 16603668890 + ... + 16603668893.

It is an arithmetic number, because the mean of its divisors is an integer number (24905503338).

Almost surely, 2^66414675566 is an apocalyptic number.

66414675566 is a deficient number, since it is larger than the sum of its proper divisors (33207337786).

66414675566 is a wasteful number, since it uses less digits than its factorization.

66414675566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33207337785.

The product of its digits is 21772800, while the sum is 56.

The spelling of 66414675566 in words is "sixty-six billion, four hundred fourteen million, six hundred seventy-five thousand, five hundred sixty-six".