666425177460 has 768 divisors, whose sum is σ = 2561986560000. Its totient is φ = 140442771456.

The previous prime is 666425177419. The next prime is 666425177477. The reversal of 666425177460 is 64771524666.

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

It is a junction number, because it is equal to n+sod(n) for n = 666425177397 and 666425177406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 414185136 + ... + 414186744.

It is an arithmetic number, because the mean of its divisors is an integer number (3335920000).

Almost surely, 2^666425177460 is an apocalyptic number.

666425177460 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 666425177460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280993280000).

666425177460 is an abundant number, since it is smaller than the sum of its proper divisors (1895561382540).

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

666425177460 is a wasteful number, since it uses less digits than its factorization.

666425177460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 666425177460 in words is "six hundred sixty-six billion, four hundred twenty-five million, one hundred seventy-seven thousand, four hundred sixty".