663670691400 has 192 divisors, whose sum is σ = 2101637808000. Its totient is φ = 173200896000.

The previous prime is 663670691399. The next prime is 663670691501. The reversal of 663670691400 is 4196076366.

It is a self number, because there is not a number n which added to its sum of digits gives 663670691400.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7237840 + ... + 7328960.

It is an arithmetic number, because the mean of its divisors is an integer number (10946030250).

Almost surely, 2^663670691400 is an apocalyptic number.

663670691400 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 663670691400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050818904000).

663670691400 is an abundant number, since it is smaller than the sum of its proper divisors (1437967116600).

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

663670691400 is a wasteful number, since it uses less digits than its factorization.

663670691400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91400 (or 91391 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 663670691400 in words is "six hundred sixty-three billion, six hundred seventy million, six hundred ninety-one thousand, four hundred".