6409426615721 has 16 divisors (see below), whose sum is σ = 6561159433920. Its totient is φ = 6259255395840.

The previous prime is 6409426615703. The next prime is 6409426615771. The reversal of 6409426615721 is 1275166249046.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6409426615721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6409426615771) 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, 5414066 + ... + 6490836.

It is an arithmetic number, because the mean of its divisors is an integer number (410072464620).

Almost surely, 2^{6409426615721} is an apocalyptic number.

It is an amenable number.

6409426615721 is a deficient number, since it is larger than the sum of its proper divisors (151732818199).

6409426615721 is a wasteful number, since it uses less digits than its factorization.

6409426615721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077496.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 6409426615721 in words is "six trillion, four hundred nine billion, four hundred twenty-six million, six hundred fifteen thousand, seven hundred twenty-one".