66226660077 has 4 divisors (see below), whose sum is σ = 88302213440. Its totient is φ = 44151106716.

The previous prime is 66226660051. The next prime is 66226660117. The reversal of 66226660077 is 77006662266.

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 not a de Polignac number, because 66226660077 - 2¹⁸ = 66226397933 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66226660037) 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, 11037776677 + ... + 11037776682.

It is an arithmetic number, because the mean of its divisors is an integer number (22075553360).

Almost surely, 2^66226660077 is an apocalyptic number.

It is an amenable number.

66226660077 is a deficient number, since it is larger than the sum of its proper divisors (22075553363).

66226660077 is a wasteful number, since it uses less digits than its factorization.

66226660077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22075553362.

The product of its (nonzero) digits is 1524096, while the sum is 48.

The spelling of 66226660077 in words is "sixty-six billion, two hundred twenty-six million, six hundred sixty thousand, seventy-seven".