66146717640 has 64 divisors (see below), whose sum is σ = 198471332160. Its totient is φ = 17636353280.

The previous prime is 66146717621. The next prime is 66146717641. The reversal of 66146717640 is 4671764166.

It is a self number, because there is not a number n which added to its sum of digits gives 66146717640.

It is not an unprimeable number, because it can be changed into a prime (66146717641) 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, 790195 + ... + 869885.

It is an arithmetic number, because the mean of its divisors is an integer number (3101114565).

Almost surely, 2^66146717640 is an apocalyptic number.

66146717640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66146717640 is an abundant number, since it is smaller than the sum of its proper divisors (132324614520).

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

66146717640 is a wasteful number, since it uses less digits than its factorization.

66146717640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86622 (or 86618 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 66146717640 in words is "sixty-six billion, one hundred forty-six million, seven hundred seventeen thousand, six hundred forty".