66761611727055 has 64 divisors (see below), whose sum is σ = 125940025171968. Its totient is φ = 29561579389440.

The previous prime is 66761611727053. The next prime is 66761611727147. The reversal of 66761611727055 is 55072711616766.

66761611727055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66761611727055 - 2¹ = 66761611727053 is a prime.

It is a super-2 number, since 2×66761611727055² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66761611727055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761611727053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37663816 + ... + 39396525.

It is an arithmetic number, because the mean of its divisors is an integer number (1967812893312).

Almost surely, 2^{66761611727055} is an apocalyptic number.

66761611727055 is a deficient number, since it is larger than the sum of its proper divisors (59178413444913).

66761611727055 is a wasteful number, since it uses less digits than its factorization.

66761611727055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77060616.

The product of its (nonzero) digits is 22226400, while the sum is 60.

The spelling of 66761611727055 in words is "sixty-six trillion, seven hundred sixty-one billion, six hundred eleven million, seven hundred twenty-seven thousand, fifty-five".