66655010505071 has 4 divisors (see below), whose sum is σ = 66794165016000. Its totient is φ = 66515855994144.

The previous prime is 66655010505053. The next prime is 66655010505077. The reversal of 66655010505071 is 17050501055666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66655010505071 is a prime.

It is a super-2 number, since 2×66655010505071² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655010505077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69577254746 + ... + 69577255703.

It is an arithmetic number, because the mean of its divisors is an integer number (16698541254000).

Almost surely, 2^{66655010505071} is an apocalyptic number.

66655010505071 is a deficient number, since it is larger than the sum of its proper divisors (139154510929).

66655010505071 is a wasteful number, since it uses less digits than its factorization.

66655010505071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139154510928.

The product of its (nonzero) digits is 945000, while the sum is 47.

The spelling of 66655010505071 in words is "sixty-six trillion, six hundred fifty-five billion, ten million, five hundred five thousand, seventy-one".