666935701344 has 384 divisors, whose sum is σ = 2144585963520. Its totient is φ = 199967040000.

The previous prime is 666935701279. The next prime is 666935701441. The reversal of 666935701344 is 443107539666.

666935701344 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 611306239 + ... + 611307329.

It is an arithmetic number, because the mean of its divisors is an integer number (5584859280).

Almost surely, 2^666935701344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666935701344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072292981760).

666935701344 is an abundant number, since it is smaller than the sum of its proper divisors (1477650262176).

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

666935701344 is a wasteful number, since it uses less digits than its factorization.

666935701344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

The spelling of 666935701344 in words is "six hundred sixty-six billion, nine hundred thirty-five million, seven hundred one thousand, three hundred forty-four".