66814747140 has 24 divisors (see below), whose sum is σ = 187081292160. Its totient is φ = 17817265888.

The previous prime is 66814747121. The next prime is 66814747159. The reversal of 66814747140 is 4174741866.

It is an interprime number because it is at equal distance from previous prime (66814747121) and next prime (66814747159).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66814747140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556789500 + ... + 556789619.

It is an arithmetic number, because the mean of its divisors is an integer number (7795053840).

Almost surely, 2^66814747140 is an apocalyptic number.

66814747140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66814747140 is an abundant number, since it is smaller than the sum of its proper divisors (120266545020).

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

66814747140 is a wasteful number, since it uses less digits than its factorization.

66814747140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113579131 (or 1113579129 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The spelling of 66814747140 in words is "sixty-six billion, eight hundred fourteen million, seven hundred forty-seven thousand, one hundred forty".