6665444537 has 2 divisors, whose sum is σ = 6665444538. Its totient is φ = 6665444536.

The previous prime is 6665444431. The next prime is 6665444557. The reversal of 6665444537 is 7354445666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6609852601 + 55591936 = 81301^2 + 7456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665444537 is a prime.

It is not a weakly prime, because it can be changed into another prime (6665444557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332722268 + 3332722269.

It is an arithmetic number, because the mean of its divisors is an integer number (3332722269).

Almost surely, 2^6665444537 is an apocalyptic number.

It is an amenable number.

6665444537 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665444537 is an equidigital number, since it uses as much as digits as its factorization.

6665444537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 50.

The square root of 6665444537 is about 81642.1737645440. The cubic root of 6665444537 is about 1881.9570439288.

The spelling of 6665444537 in words is "six billion, six hundred sixty-five million, four hundred forty-four thousand, five hundred thirty-seven".