66711071071 has 4 divisors (see below), whose sum is σ = 66712221432. Its totient is φ = 66709920712.

The previous prime is 66711071059. The next prime is 66711071083. The reversal of 66711071071 is 17017011766.

66711071071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (66711071059) and next prime (66711071083).

It is a cyclic number.

It is not a de Polignac number, because 66711071071 - 2⁵ = 66711071039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66711071071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66711371071) 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, 483301 + ... + 605806.

It is an arithmetic number, because the mean of its divisors is an integer number (16678055358).

Almost surely, 2^66711071071 is an apocalyptic number.

66711071071 is a deficient number, since it is larger than the sum of its proper divisors (1150361).

66711071071 is a wasteful number, since it uses less digits than its factorization.

66711071071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150360.

The product of its (nonzero) digits is 12348, while the sum is 37.

The spelling of 66711071071 in words is "sixty-six billion, seven hundred eleven million, seventy-one thousand, seventy-one".