666973647360 has 280 divisors, whose sum is σ = 2397670183260. Its totient is φ = 177859141632.

The previous prime is 666973647281. The next prime is 666973647377. The reversal of 666973647360 is 63746379666.

It can be written as a sum of positive squares in 2 ways, for example, as 633896222976 + 33077424384 = 796176^2 + 181872^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1687546 + ... + 2044934.

Almost surely, 2^666973647360 is an apocalyptic number.

666973647360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666973647360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198835091630).

666973647360 is an abundant number, since it is smaller than the sum of its proper divisors (1730696535900).

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

666973647360 is an frugal number, since it uses more digits than its factorization.

666973647360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357430 (or 357399 counting only the distinct ones).

The product of its (nonzero) digits is 123451776, while the sum is 63.

The spelling of 666973647360 in words is "six hundred sixty-six billion, nine hundred seventy-three million, six hundred forty-seven thousand, three hundred sixty".