666196070400 has 936 divisors, whose sum is σ = 2801760251264. Its totient is φ = 148104806400.

The previous prime is 666196070383. The next prime is 666196070459. The reversal of 666196070400 is 4070691666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 238693005 + ... + 238695795.

Almost surely, 2^666196070400 is an apocalyptic number.

666196070400 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 666196070400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1400880125632).

666196070400 is an abundant number, since it is smaller than the sum of its proper divisors (2135564180864).

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

666196070400 is a wasteful number, since it uses less digits than its factorization.

666196070400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875 (or 2845 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 666196070400 in words is "six hundred sixty-six billion, one hundred ninety-six million, seventy thousand, four hundred".