6415688545549 has 2 divisors, whose sum is σ = 6415688545550. Its totient is φ = 6415688545548.

The previous prime is 6415688545537. The next prime is 6415688545633. The reversal of 6415688545549 is 9455458865146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4966992255625 + 1448696289924 = 2228675^2 + 1203618^2 .

It is a cyclic number.

It is not a de Polignac number, because 6415688545549 - 2⁵ = 6415688545517 is a prime.

It is a super-2 number, since 2×6415688545549² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6415688645549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3207844272774 + 3207844272775.

It is an arithmetic number, because the mean of its divisors is an integer number (3207844272775).

Almost surely, 2^{6415688545549} is an apocalyptic number.

It is an amenable number.

6415688545549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6415688545549 is an equidigital number, since it uses as much as digits as its factorization.

6415688545549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440000, while the sum is 70.

The spelling of 6415688545549 in words is "six trillion, four hundred fifteen billion, six hundred eighty-eight million, five hundred forty-five thousand, five hundred forty-nine".