666975185141760 has 4256 divisors, whose sum is σ = 2851842107658240. Its totient is φ = 147990144614400.

The previous prime is 666975185141653. The next prime is 666975185141773. The reversal of 666975185141760 is 67141581579666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 7494103203796 + ... + 7494103203884.

Almost surely, 2^{666975185141760} is an apocalyptic number.

666975185141760 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 666975185141760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425921053829120).

666975185141760 is an abundant number, since it is smaller than the sum of its proper divisors (2184866922516480).

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

666975185141760 is an frugal number, since it uses more digits than its factorization.

666975185141760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 457228800, while the sum is 72.

The spelling of 666975185141760 in words is "six hundred sixty-six trillion, nine hundred seventy-five billion, one hundred eighty-five million, one hundred forty-one thousand, seven hundred sixty".