66814681340 has 48 divisors (see below), whose sum is σ = 155003950080. Its totient is φ = 23988694080.

The previous prime is 66814681247. The next prime is 66814681391. The reversal of 66814681340 is 4318641866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1904792 + ... + 1939551.

It is an arithmetic number, because the mean of its divisors is an integer number (3229248960).

Almost surely, 2^66814681340 is an apocalyptic number.

It is an amenable number.

66814681340 is an abundant number, since it is smaller than the sum of its proper divisors (88189268740).

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

66814681340 is a wasteful number, since it uses less digits than its factorization.

66814681340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844442 (or 3844440 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 66814681340 in words is "sixty-six billion, eight hundred fourteen million, six hundred eighty-one thousand, three hundred forty".