66643626740514 has 64 divisors (see below), whose sum is σ = 139804557465600. Its totient is φ = 21138391169280.

The previous prime is 66643626740513. The next prime is 66643626740521. The reversal of 66643626740514 is 41504762634666.

It is not an unprimeable number, because it can be changed into a prime (66643626740513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167071834 + ... + 167470250.

It is an arithmetic number, because the mean of its divisors is an integer number (2184446210400).

Almost surely, 2^{66643626740514} is an apocalyptic number.

66643626740514 is an abundant number, since it is smaller than the sum of its proper divisors (73160930725086).

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

66643626740514 is a wasteful number, since it uses less digits than its factorization.

66643626740514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404735.

The product of its (nonzero) digits is 104509440, while the sum is 60.

The spelling of 66643626740514 in words is "sixty-six trillion, six hundred forty-three billion, six hundred twenty-six million, seven hundred forty thousand, five hundred fourteen".