66640242064460 has 48 divisors (see below), whose sum is σ = 143139776675616. Its totient is φ = 26051388260352.

The previous prime is 66640242064271. The next prime is 66640242064463. The reversal of 66640242064460 is 6446024204666.

It is a junction number, because it is equal to n+sod(n) for n = 66640242064399 and 66640242064408.

It is not an unprimeable number, because it can be changed into a prime (66640242064463) 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, 122039162 + ... + 122584001.

It is an arithmetic number, because the mean of its divisors is an integer number (2982078680742).

Almost surely, 2^{66640242064460} is an apocalyptic number.

It is an amenable number.

66640242064460 is an abundant number, since it is smaller than the sum of its proper divisors (76499534611156).

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

66640242064460 is a wasteful number, since it uses less digits than its factorization.

66640242064460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244623482 (or 244623480 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 66640242064460 in words is "sixty-six trillion, six hundred forty billion, two hundred forty-two million, sixty-four thousand, four hundred sixty".