6481708646399 has 16 divisors (see below), whose sum is σ = 7433434644480. Its totient is φ = 5536455119520.

The previous prime is 6481708646323. The next prime is 6481708646401. The reversal of 6481708646399 is 9936468071846.

It is a Cunningham number, because it is equal to 2545920²-1.

It is a cyclic number.

It is not a de Polignac number, because 6481708646399 - 2⁴⁰ = 5382197018623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6481708246399) 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, 1272962 + ... + 3818880.

It is an arithmetic number, because the mean of its divisors is an integer number (464589665280).

Almost surely, 2^{6481708646399} is an apocalyptic number.

6481708646399 is a deficient number, since it is larger than the sum of its proper divisors (951725998081).

6481708646399 is a wasteful number, since it uses less digits than its factorization.

6481708646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547190.

The product of its (nonzero) digits is 376233984, while the sum is 71.

The spelling of 6481708646399 in words is "six trillion, four hundred eighty-one billion, seven hundred eight million, six hundred forty-six thousand, three hundred ninety-nine".