66660000001071 has 4 divisors (see below), whose sum is σ = 88880000001432. Its totient is φ = 44440000000712.

The previous prime is 66660000001069. The next prime is 66660000001093. The reversal of 66660000001071 is 17010000006666.

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

It is a cyclic number.

It is not a de Polignac number, because 66660000001071 - 2¹ = 66660000001069 is a prime.

It is a super-2 number, since 2×66660000001071² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660000041071) 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, 11110000000176 + ... + 11110000000181.

It is an arithmetic number, because the mean of its divisors is an integer number (22220000000358).

Almost surely, 2^{66660000001071} is an apocalyptic number.

66660000001071 is a deficient number, since it is larger than the sum of its proper divisors (22220000000361).

66660000001071 is a wasteful number, since it uses less digits than its factorization.

66660000001071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22220000000360.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 66660000001071 in words is "sixty-six trillion, six hundred sixty billion, one thousand, seventy-one".