6544331397 has 12 divisors (see below), whose sum is σ = 9480977740. Its totient is φ = 4349939328.

The previous prime is 6544331263. The next prime is 6544331413. The reversal of 6544331397 is 7931334456.

6544331397 is a `hidden beast` number, since 6 + 544 + 3 + 3 + 13 + 97 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1395694881 + 5148636516 = 37359^2 + 71754^2 .

It is not a de Polignac number, because 6544331397 - 2²³ = 6535942789 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 (6544331897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1075822 + ... + 1081887.

Almost surely, 2^6544331397 is an apocalyptic number.

It is an amenable number.

6544331397 is a deficient number, since it is larger than the sum of its proper divisors (2936646343).

6544331397 is a wasteful number, since it uses less digits than its factorization.

6544331397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158052 (or 2158049 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 6544331397 is about 80897.0419545733. The cubic root of 6544331397 is about 1870.4887240059.

The spelling of 6544331397 in words is "six billion, five hundred forty-four million, three hundred thirty-one thousand, three hundred ninety-seven".