3639640913897 has 2 divisors, whose sum is σ = 3639640913898. Its totient is φ = 3639640913896.

The previous prime is 3639640913873. The next prime is 3639640913917. The reversal of 3639640913897 is 7983190469363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2195920914496 + 1443719999401 = 1481864^2 + 1201549^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639640913897 - 2⁶ = 3639640913833 is a prime.

It is a super-2 number, since 2×3639640913897² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3639640913837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819820456948 + 1819820456949.

It is an arithmetic number, because the mean of its divisors is an integer number (1819820456949).

Almost surely, 2^{3639640913897} is an apocalyptic number.

It is an amenable number.

3639640913897 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639640913897 is an equidigital number, since it uses as much as digits as its factorization.

3639640913897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158723712, while the sum is 68.

The spelling of 3639640913897 in words is "three trillion, six hundred thirty-nine billion, six hundred forty million, nine hundred thirteen thousand, eight hundred ninety-seven".