6346660722721 has 16 divisors (see below), whose sum is σ = 7188232789440. Its totient is φ = 5550625644480.

The previous prime is 6346660722697. The next prime is 6346660722751. The reversal of 6346660722721 is 1272270666436.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6346660722721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6346660722751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35824071 + ... + 36000796.

It is an arithmetic number, because the mean of its divisors is an integer number (449264549340).

Almost surely, 2^{6346660722721} is an apocalyptic number.

It is an amenable number.

6346660722721 is a deficient number, since it is larger than the sum of its proper divisors (841572066719).

6346660722721 is a wasteful number, since it uses less digits than its factorization.

6346660722721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71825184.

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 6346660722721 in words is "six trillion, three hundred forty-six billion, six hundred sixty million, seven hundred twenty-two thousand, seven hundred twenty-one".