18735370517 has 2 divisors, whose sum is σ = 18735370518. Its totient is φ = 18735370516.

The previous prime is 18735370501. The next prime is 18735370519. The reversal of 18735370517 is 71507353781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17306454916 + 1428915601 = 131554^2 + 37801^2 .

It is a cyclic number.

It is not a de Polignac number, because 18735370517 - 2⁴ = 18735370501 is a prime.

Together with 18735370519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18735370519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367685258 + 9367685259.

It is an arithmetic number, because the mean of its divisors is an integer number (9367685259).

Almost surely, 2^18735370517 is an apocalyptic number.

It is an amenable number.

18735370517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18735370517 is an equidigital number, since it uses as much as digits as its factorization.

18735370517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 617400, while the sum is 47.

The spelling of 18735370517 in words is "eighteen billion, seven hundred thirty-five million, three hundred seventy thousand, five hundred seventeen".