18518501653 has 2 divisors, whose sum is σ = 18518501654. Its totient is φ = 18518501652.

The previous prime is 18518501597. The next prime is 18518501669. The reversal of 18518501653 is 35610581581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18457396164 + 61105489 = 135858^2 + 7817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18518501653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518591653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259250826 + 9259250827.

It is an arithmetic number, because the mean of its divisors is an integer number (9259250827).

Almost surely, 2^18518501653 is an apocalyptic number.

It is an amenable number.

18518501653 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518501653 is an equidigital number, since it uses as much as digits as its factorization.

18518501653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144000, while the sum is 43.

The spelling of 18518501653 in words is "eighteen billion, five hundred eighteen million, five hundred one thousand, six hundred fifty-three".