18649543013 has 2 divisors, whose sum is σ = 18649543014. Its totient is φ = 18649543012.

The previous prime is 18649542983. The next prime is 18649543049. The reversal of 18649543013 is 31034594681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15821111524 + 2828431489 = 125782^2 + 53183^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649543013 - 2⁸ = 18649542757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18649543093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324771506 + 9324771507.

It is an arithmetic number, because the mean of its divisors is an integer number (9324771507).

Almost surely, 2^18649543013 is an apocalyptic number.

It is an amenable number.

18649543013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18649543013 is an equidigital number, since it uses as much as digits as its factorization.

18649543013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 18649543013 in words is "eighteen billion, six hundred forty-nine million, five hundred forty-three thousand, thirteen".