66770711077 has 12 divisors (see below), whose sum is σ = 80350399980. Its totient is φ = 55258518336.

The previous prime is 66770711057. The next prime is 66770711083. The reversal of 66770711077 is 77011707766.

It is a happy number.

66770711077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45932633761 + 20838077316 = 214319^2 + 144354^2 .

It is not a de Polignac number, because 66770711077 - 2¹⁵ = 66770678309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

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 66770711077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770711017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23492848 + ... + 23495689.

It is an arithmetic number, because the mean of its divisors is an integer number (6695866665).

Almost surely, 2^66770711077 is an apocalyptic number.

It is an amenable number.

66770711077 is a deficient number, since it is larger than the sum of its proper divisors (13579688903).

66770711077 is a wasteful number, since it uses less digits than its factorization.

66770711077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46988580 (or 46988573 counting only the distinct ones).

The product of its (nonzero) digits is 605052, while the sum is 49.

The spelling of 66770711077 in words is "sixty-six billion, seven hundred seventy million, seven hundred eleven thousand, seventy-seven".