66545255077 has 16 divisors (see below), whose sum is σ = 77776957440. Its totient is φ = 55748209968.

The previous prime is 66545255069. The next prime is 66545255089. The reversal of 66545255077 is 77055254566.

66545255077 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 66545255077 - 2³ = 66545255069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545256077) 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, 100074 + ... + 378292.

It is an arithmetic number, because the mean of its divisors is an integer number (4861059840).

Almost surely, 2^66545255077 is an apocalyptic number.

It is an amenable number.

66545255077 is a deficient number, since it is larger than the sum of its proper divisors (11231702363).

66545255077 is a wasteful number, since it uses less digits than its factorization.

66545255077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279000.

The product of its (nonzero) digits is 8820000, while the sum is 52.

The spelling of 66545255077 in words is "sixty-six billion, five hundred forty-five million, two hundred fifty-five thousand, seventy-seven".