66531413566 has 16 divisors (see below), whose sum is σ = 101161146240. Its totient is φ = 32814073240.

The previous prime is 66531413549. The next prime is 66531413587.

It is a happy number.

66531413566 is nontrivially palindromic in base 10.

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 in 7 ways as a sum of consecutive naturals, for example, 716536 + ... + 804043.

It is an arithmetic number, because the mean of its divisors is an integer number (6322571640).

Almost surely, 2^66531413566 is an apocalyptic number.

66531413566 is a deficient number, since it is larger than the sum of its proper divisors (34629732674).

66531413566 is a wasteful number, since it uses less digits than its factorization.

66531413566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520879.

The product of its digits is 1166400, while the sum is 46.

The spelling of 66531413566 in words is "sixty-six billion, five hundred thirty-one million, four hundred thirteen thousand, five hundred sixty-six".