6681401316 has 30 divisors (see below), whose sum is σ = 17466503670. Its totient is φ = 2227133664.

The previous prime is 6681401267. The next prime is 6681401333. The reversal of 6681401316 is 6131041866.

It can be written as a sum of positive squares in only one way, i.e., 6488302500 + 193098816 = 80550^2 + 13896^2 .

It is a super-2 number, since 2×6681401316² = 89282247090893063712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10310481 + ... + 10311128.

It is an arithmetic number, because the mean of its divisors is an integer number (582216789).

Almost surely, 2^6681401316 is an apocalyptic number.

It is an amenable number.

6681401316 is an abundant number, since it is smaller than the sum of its proper divisors (10785102354).

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

6681401316 is a wasteful number, since it uses less digits than its factorization.

6681401316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20621625 (or 20621614 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 6681401316 is about 81739.8392217650. The cubic root of 6681401316 is about 1883.4576210630.

The spelling of 6681401316 in words is "six billion, six hundred eighty-one million, four hundred one thousand, three hundred sixteen".