6999646280544 has 144 divisors (see below), whose sum is σ = 19955201666400. Its totient is φ = 2327366246400.

The previous prime is 6999646280521. The next prime is 6999646280573. The reversal of 6999646280544 is 4450826469996.

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 a congruent number.

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, 213380944 + ... + 213413744.

It is an arithmetic number, because the mean of its divisors is an integer number (138577789350).

Almost surely, 2^{6999646280544} 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 6999646280544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9977600833200).

6999646280544 is an abundant number, since it is smaller than the sum of its proper divisors (12955555385856).

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

6999646280544 is a wasteful number, since it uses less digits than its factorization.

6999646280544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34653 (or 34642 counting only the distinct ones).

The product of its (nonzero) digits is 806215680, while the sum is 72.

The spelling of 6999646280544 in words is "six trillion, nine hundred ninety-nine billion, six hundred forty-six million, two hundred eighty thousand, five hundred forty-four".