13601218649 has 2 divisors, whose sum is σ = 13601218650. Its totient is φ = 13601218648.

The previous prime is 13601218639. The next prime is 13601218663. The reversal of 13601218649 is 94681210631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9440065600 + 4161153049 = 97160^2 + 64507^2 .

It is a cyclic number.

It is not a de Polignac number, because 13601218649 - 2⁴ = 13601218633 is a prime.

It is not a weakly prime, because it can be changed into another prime (13601218639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6800609324 + 6800609325.

It is an arithmetic number, because the mean of its divisors is an integer number (6800609325).

Almost surely, 2^13601218649 is an apocalyptic number.

It is an amenable number.

13601218649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13601218649 is an equidigital number, since it uses as much as digits as its factorization.

13601218649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 13601218649 in words is "thirteen billion, six hundred one million, two hundred eighteen thousand, six hundred forty-nine".