6999609207456 has 144 divisors (see below), whose sum is σ = 19965054904704. Its totient is φ = 2326187538432.

The previous prime is 6999609207443. The next prime is 6999609207491. The reversal of 6999609207456 is 6547029069996.

6999609207456 is a `hidden beast` number, since 6 + 9 + 9 + 9 + 609 + 2 + 0 + 7 + 4 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185415975 + ... + 185453721.

It is an arithmetic number, because the mean of its divisors is an integer number (138646214616).

Almost surely, 2^{6999609207456} 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 6999609207456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9982527452352).

6999609207456 is an abundant number, since it is smaller than the sum of its proper divisors (12965445697248).

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

6999609207456 is a wasteful number, since it uses less digits than its factorization.

6999609207456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39683 (or 39672 counting only the distinct ones).

The product of its (nonzero) digits is 396809280, while the sum is 72.

The spelling of 6999609207456 in words is "six trillion, nine hundred ninety-nine billion, six hundred nine million, two hundred seven thousand, four hundred fifty-six".