66744107071 has 4 divisors (see below), whose sum is σ = 66834424600. Its totient is φ = 66653789544.

The previous prime is 66744107063. The next prime is 66744107081. The reversal of 66744107071 is 17070144766.

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 66744107071 - 2³ = 66744107063 is a prime.

It is a super-2 number, since 2×66744107071² (a number of 22 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 (66744107021) 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, 45157656 + ... + 45159133.

It is an arithmetic number, because the mean of its divisors is an integer number (16708606150).

Almost surely, 2^66744107071 is an apocalyptic number.

66744107071 is a deficient number, since it is larger than the sum of its proper divisors (90317529).

66744107071 is an equidigital number, since it uses as much as digits as its factorization.

66744107071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90317528.

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 66744107071 in words is "sixty-six billion, seven hundred forty-four million, one hundred seven thousand, seventy-one".