66661567116 has 48 divisors (see below), whose sum is σ = 157407640320. Its totient is φ = 21955147200.

The previous prime is 66661567111. The next prime is 66661567151. The reversal of 66661567116 is 61176516666.

It is a happy number.

66661567116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66661567111) 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, 533775 + ... + 646713.

It is an arithmetic number, because the mean of its divisors is an integer number (3279325840).

Almost surely, 2^66661567116 is an apocalyptic number.

It is an amenable number.

66661567116 is an abundant number, since it is smaller than the sum of its proper divisors (90746073204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66661567116 is a wasteful number, since it uses less digits than its factorization.

66661567116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113534 (or 113532 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The spelling of 66661567116 in words is "sixty-six billion, six hundred sixty-one million, five hundred sixty-seven thousand, one hundred sixteen".