66311061255 has 24 divisors (see below), whose sum is σ = 114964040880. Its totient is φ = 35358247680.

The previous prime is 66311061209. The next prime is 66311061259. The reversal of 66311061255 is 55216011366.

66311061255 is a `hidden beast` number, since 6 + 6 + 31 + 1 + 0 + 612 + 5 + 5 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-66311061255 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66311061259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54031 + ... + 368159.

It is an arithmetic number, because the mean of its divisors is an integer number (4790168370).

Almost surely, 2^66311061255 is an apocalyptic number.

66311061255 is a deficient number, since it is larger than the sum of its proper divisors (48652979625).

66311061255 is a wasteful number, since it uses less digits than its factorization.

66311061255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318831 (or 318828 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 66311061255 in words is "sixty-six billion, three hundred eleven million, sixty-one thousand, two hundred fifty-five".