66654031655 has 16 divisors (see below), whose sum is σ = 82172141184. Its totient is φ = 51865920000.

The previous prime is 66654031627. The next prime is 66654031679. The reversal of 66654031655 is 55613045666.

It is not a de Polignac number, because 66654031655 - 2⁸ = 66654031399 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558530 + ... + 667280.

It is an arithmetic number, because the mean of its divisors is an integer number (5135758824).

Almost surely, 2^66654031655 is an apocalyptic number.

66654031655 is a deficient number, since it is larger than the sum of its proper divisors (15518109529).

66654031655 is a wasteful number, since it uses less digits than its factorization.

66654031655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112106.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 66654031655 in words is "sixty-six billion, six hundred fifty-four million, thirty-one thousand, six hundred fifty-five".