13557294649 has 2 divisors, whose sum is σ = 13557294650. Its totient is φ = 13557294648.

The previous prime is 13557294631. The next prime is 13557294677. The reversal of 13557294649 is 94649275531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12800659600 + 756635049 = 113140^2 + 27507^2 .

It is a cyclic number.

It is not a de Polignac number, because 13557294649 - 2⁹ = 13557294137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13557294649.

It is not a weakly prime, because it can be changed into another prime (13557294629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6778647324 + 6778647325.

It is an arithmetic number, because the mean of its divisors is an integer number (6778647325).

Almost surely, 2^13557294649 is an apocalyptic number.

It is an amenable number.

13557294649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13557294649 is an equidigital number, since it uses as much as digits as its factorization.

13557294649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 55.

The spelling of 13557294649 in words is "thirteen billion, five hundred fifty-seven million, two hundred ninety-four thousand, six hundred forty-nine".