66650613077177 has 4 divisors (see below), whose sum is σ = 66896556299136. Its totient is φ = 66404669855220.

The previous prime is 66650613077107. The next prime is 66650613077179. The reversal of 66650613077177 is 77177031605666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66650613077177 - 2⁴⁰ = 65551101449401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66650613077179) 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, 122971610573 + ... + 122971611114.

It is an arithmetic number, because the mean of its divisors is an integer number (16724139074784).

Almost surely, 2^{66650613077177} is an apocalyptic number.

It is an amenable number.

66650613077177 is a deficient number, since it is larger than the sum of its proper divisors (245943221959).

66650613077177 is a wasteful number, since it uses less digits than its factorization.

66650613077177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245943221958.

The product of its (nonzero) digits is 46675440, while the sum is 62.

The spelling of 66650613077177 in words is "sixty-six trillion, six hundred fifty billion, six hundred thirteen million, seventy-seven thousand, one hundred seventy-seven".