6981263616 has 72 divisors (see below), whose sum is σ = 18621935584. Its totient is φ = 2321879040.

The previous prime is 6981263599. The next prime is 6981263621. The reversal of 6981263616 is 6163621896.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341031 + ... + 360921.

Almost surely, 2^6981263616 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 6981263616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9310967792).

6981263616 is an abundant number, since it is smaller than the sum of its proper divisors (11640671968).

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

6981263616 is a wasteful number, since it uses less digits than its factorization.

6981263616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20367 (or 20353 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 6981263616 is about 83553.9563156647. The cubic root of 6981263616 is about 1911.2229237788. Note that the first 3 decimals are identical.

The spelling of 6981263616 in words is "six billion, nine hundred eighty-one million, two hundred sixty-three thousand, six hundred sixteen".