66566703740 has 48 divisors (see below), whose sum is σ = 143262653184. Its totient is φ = 25965811200.

The previous prime is 66566703739. The next prime is 66566703743. The reversal of 66566703740 is 4730766566.

It is a super-2 number, since 2×66566703740² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566703743) 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, 1981685 + ... + 2014995.

It is an arithmetic number, because the mean of its divisors is an integer number (2984638608).

Almost surely, 2^66566703740 is an apocalyptic number.

It is an amenable number.

66566703740 is an abundant number, since it is smaller than the sum of its proper divisors (76695949444).

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

66566703740 is a wasteful number, since it uses less digits than its factorization.

66566703740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35798 (or 35796 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 50.

The spelling of 66566703740 in words is "sixty-six billion, five hundred sixty-six million, seven hundred three thousand, seven hundred forty".