66641770340 has 24 divisors (see below), whose sum is σ = 141186197880. Its totient is φ = 26420807168.

The previous prime is 66641770333. The next prime is 66641770357. The reversal of 66641770340 is 4307714666.

It can be written as a sum of positive squares in 4 ways, for example, as 5515141696 + 61126628644 = 74264^2 + 247238^2 .

It is a super-2 number, since 2×66641770340² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66641770291 and 66641770300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14741495 + ... + 14746014.

It is an arithmetic number, because the mean of its divisors is an integer number (5882758245).

Almost surely, 2^66641770340 is an apocalyptic number.

It is an amenable number.

66641770340 is an abundant number, since it is smaller than the sum of its proper divisors (74544427540).

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

66641770340 is a wasteful number, since it uses less digits than its factorization.

66641770340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29487631 (or 29487629 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 66641770340 in words is "sixty-six billion, six hundred forty-one million, seven hundred seventy thousand, three hundred forty".