66106570655 has 8 divisors (see below), whose sum is σ = 79517214000. Its totient is φ = 52759037056.

The previous prime is 66106570637. The next prime is 66106570723. The reversal of 66106570655 is 55607560166.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66106570655 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15775130 + ... + 15779319.

It is an arithmetic number, because the mean of its divisors is an integer number (9939651750).

Almost surely, 2^66106570655 is an apocalyptic number.

66106570655 is a deficient number, since it is larger than the sum of its proper divisors (13410643345).

66106570655 is a wasteful number, since it uses less digits than its factorization.

66106570655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31554873.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 66106570655 in words is "sixty-six billion, one hundred six million, five hundred seventy thousand, six hundred fifty-five".