66740055613 has 16 divisors (see below), whose sum is σ = 83390500224. Its totient is φ = 51891413760.

The previous prime is 66740055607. The next prime is 66740055617. The reversal of 66740055613 is 31655004766.

66740055613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66740055613 - 2²⁵ = 66706501181 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 66740055613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740055617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 913120 + ... + 983497.

It is an arithmetic number, because the mean of its divisors is an integer number (5211906264).

Almost surely, 2^66740055613 is an apocalyptic number.

It is an amenable number.

66740055613 is a deficient number, since it is larger than the sum of its proper divisors (16650444611).

66740055613 is a wasteful number, since it uses less digits than its factorization.

66740055613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897092.

The product of its (nonzero) digits is 453600, while the sum is 43.

The spelling of 66740055613 in words is "sixty-six billion, seven hundred forty million, fifty-five thousand, six hundred thirteen".