669561399252600 has 192 divisors, whose sum is σ = 2143018468039680. Its totient is φ = 172756007040000.

The previous prime is 669561399252593. The next prime is 669561399252619. The reversal of 669561399252600 is 6252993165966.

It is a congruent number.

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, 90964195 + ... + 98049005.

It is an arithmetic number, because the mean of its divisors is an integer number (11161554521040).

Almost surely, 2^{669561399252600} is an apocalyptic number.

669561399252600 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 669561399252600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071509234019840).

669561399252600 is an abundant number, since it is smaller than the sum of its proper divisors (1473457068787080).

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

669561399252600 is a wasteful number, since it uses less digits than its factorization.

669561399252600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7089942 (or 7089933 counting only the distinct ones).

The product of its (nonzero) digits is 283435200, while the sum is 69.

The spelling of 669561399252600 in words is "six hundred sixty-nine trillion, five hundred sixty-one billion, three hundred ninety-nine million, two hundred fifty-two thousand, six hundred".