666740667340 has 48 divisors (see below), whose sum is σ = 1527614855424. Its totient is φ = 242423755200.

The previous prime is 666740667293. The next prime is 666740667361. The reversal of 666740667340 is 43766047666.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1833337 + ... + 2166703.

It is an arithmetic number, because the mean of its divisors is an integer number (31825309488).

Almost surely, 2^666740667340 is an apocalyptic number.

It is an amenable number.

666740667340 is an abundant number, since it is smaller than the sum of its proper divisors (860874188084).

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

666740667340 is a wasteful number, since it uses less digits than its factorization.

666740667340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342478 (or 342476 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 55.

The spelling of 666740667340 in words is "six hundred sixty-six billion, seven hundred forty million, six hundred sixty-seven thousand, three hundred forty".