66512793611 has 16 divisors (see below), whose sum is σ = 73402119648. Its totient is φ = 59765952000.

The previous prime is 66512793583. The next prime is 66512793617. The reversal of 66512793611 is 11639721566.

It is a cyclic number.

It is not a de Polignac number, because 66512793611 - 2³⁰ = 65439051787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66512793617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 608345 + ... + 709301.

It is an arithmetic number, because the mean of its divisors is an integer number (4587632478).

Almost surely, 2^66512793611 is an apocalyptic number.

66512793611 is a deficient number, since it is larger than the sum of its proper divisors (6889326037).

66512793611 is a wasteful number, since it uses less digits than its factorization.

66512793611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101662.

The product of its digits is 408240, while the sum is 47.

It can be divided in two parts, 665127936 and 11, that multiplied together give a square (7316407296 = 85536²).

The spelling of 66512793611 in words is "sixty-six billion, five hundred twelve million, seven hundred ninety-three thousand, six hundred eleven".