6699332640 has 768 divisors, whose sum is σ = 28872474624. Its totient is φ = 1260748800.

The previous prime is 6699332639. The next prime is 6699332669. The reversal of 6699332640 is 462339966.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 6699332640.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 35074945 + ... + 35075135.

It is an arithmetic number, because the mean of its divisors is an integer number (37594368).

Almost surely, 2^6699332640 is an apocalyptic number.

6699332640 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 6699332640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14436237312).

6699332640 is an abundant number, since it is smaller than the sum of its proper divisors (22173141984).

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

6699332640 is a wasteful number, since it uses less digits than its factorization.

6699332640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 48.

The square root of 6699332640 is about 81849.4510671880. The cubic root of 6699332640 is about 1885.1410364305.

The spelling of 6699332640 in words is "six billion, six hundred ninety-nine million, three hundred thirty-two thousand, six hundred forty".