3639974333549 has 2 divisors, whose sum is σ = 3639974333550. Its totient is φ = 3639974333548.

The previous prime is 3639974333531. The next prime is 3639974333563. The reversal of 3639974333549 is 9453334799363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1823121052900 + 1816853280649 = 1350230^2 + 1347907^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639974333549 - 2⁸ = 3639974333293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3639974332549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819987166774 + 1819987166775.

It is an arithmetic number, because the mean of its divisors is an integer number (1819987166775).

Almost surely, 2^{3639974333549} is an apocalyptic number.

It is an amenable number.

3639974333549 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639974333549 is an equidigital number, since it uses as much as digits as its factorization.

3639974333549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 595213920, while the sum is 68.

The spelling of 3639974333549 in words is "three trillion, six hundred thirty-nine billion, nine hundred seventy-four million, three hundred thirty-three thousand, five hundred forty-nine".