666425177406 has 96 divisors (see below), whose sum is σ = 1503970191360. Its totient is φ = 221169121056.

The previous prime is 666425177309. The next prime is 666425177417. The reversal of 666425177406 is 604771524666.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120748315 + ... + 120753833.

It is an arithmetic number, because the mean of its divisors is an integer number (15666356160).

Almost surely, 2^666425177406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666425177406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751985095680).

666425177406 is an abundant number, since it is smaller than the sum of its proper divisors (837545013954).

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

666425177406 is a wasteful number, since it uses less digits than its factorization.

666425177406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580 (or 6568 counting only the distinct ones).

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

The spelling of 666425177406 in words is "six hundred sixty-six billion, four hundred twenty-five million, one hundred seventy-seven thousand, four hundred six".