66100506566 has 8 divisors (see below), whose sum is σ = 99162845184. Its totient is φ = 33046224840.

The previous prime is 66100506559. The next prime is 66100506583. The reversal of 66100506566 is 66560500166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66100506566² (a number of 22 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1993670 + ... + 2026553.

It is an arithmetic number, because the mean of its divisors is an integer number (12395355648).

Almost surely, 2^66100506566 is an apocalyptic number.

66100506566 is a deficient number, since it is larger than the sum of its proper divisors (33062338618).

66100506566 is a wasteful number, since it uses less digits than its factorization.

66100506566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028446.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 66100506566 in words is "sixty-six billion, one hundred million, five hundred six thousand, five hundred sixty-six".