6699661258752 has 1248 divisors, whose sum is σ = 25269966292480. Its totient is φ = 1738201006080.

The previous prime is 6699661258733. The next prime is 6699661258757. The reversal of 6699661258752 is 2578521669966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6699661258757) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7587384903 + ... + 7587385785.

Almost surely, 2^{6699661258752} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6699661258752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12634983146240).

6699661258752 is an abundant number, since it is smaller than the sum of its proper divisors (18570305033728).

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

6699661258752 is an frugal number, since it uses more digits than its factorization.

6699661258752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957 (or 906 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 72.

The spelling of 6699661258752 in words is "six trillion, six hundred ninety-nine billion, six hundred sixty-one million, two hundred fifty-eight thousand, seven hundred fifty-two".