66666740740 has 48 divisors (see below), whose sum is σ = 141461192880. Its totient is φ = 26388684800.

The previous prime is 66666740737. The next prime is 66666740753. The reversal of 66666740740 is 4704766666.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4774257216 + 61892483524 = 69096^2 + 248782^2 .

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 15 ways as a sum of consecutive naturals, for example, 4341396 + ... + 4356724.

It is an arithmetic number, because the mean of its divisors is an integer number (2947108185).

Almost surely, 2^66666740740 is an apocalyptic number.

It is an amenable number.

66666740740 is an abundant number, since it is smaller than the sum of its proper divisors (74794452140).

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

66666740740 is a wasteful number, since it uses less digits than its factorization.

66666740740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17592 (or 17590 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 66666740740 in words is "sixty-six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred forty".