669241958400 has 420 divisors, whose sum is σ = 2479245025752. Its totient is φ = 178460098560.

The previous prime is 669241958393. The next prime is 669241958417. The reversal of 669241958400 is 4859142966.

669241958400 is a `hidden beast` number, since 66 + 92 + 4 + 1 + 95 + 8 + 400 = 666.

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 polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 16568629 + ... + 16608971.

Almost surely, 2^669241958400 is an apocalyptic number.

669241958400 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 669241958400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239622512876).

669241958400 is an abundant number, since it is smaller than the sum of its proper divisors (1810003067352).

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

669241958400 is an equidigital number, since it uses as much as digits as its factorization.

669241958400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40391 (or 40353 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 669241958400 in words is "six hundred sixty-nine billion, two hundred forty-one million, nine hundred fifty-eight thousand, four hundred".