66740606719 has 4 divisors (see below), whose sum is σ = 68292713896. Its totient is φ = 65188499544.

The previous prime is 66740606711. The next prime is 66740606741. The reversal of 66740606719 is 91760604766.

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 66740606719 - 2³ = 66740606711 is a prime.

It is a super-2 number, since 2×66740606719² (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 (66740606711) 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, 776053524 + ... + 776053609.

It is an arithmetic number, because the mean of its divisors is an integer number (17073178474).

Almost surely, 2^66740606719 is an apocalyptic number.

66740606719 is a deficient number, since it is larger than the sum of its proper divisors (1552107177).

66740606719 is a wasteful number, since it uses less digits than its factorization.

66740606719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552107176.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 66740606719 in words is "sixty-six billion, seven hundred forty million, six hundred six thousand, seven hundred nineteen".