17993687057 has 2 divisors, whose sum is σ = 17993687058. Its totient is φ = 17993687056.

The previous prime is 17993687029. The next prime is 17993687071. The reversal of 17993687057 is 75078639971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17504348416 + 489338641 = 132304^2 + 22121^2 .

It is a cyclic number.

It is not a de Polignac number, because 17993687057 - 2¹⁸ = 17993424913 is a prime.

It is not a weakly prime, because it can be changed into another prime (17993687357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8996843528 + 8996843529.

It is an arithmetic number, because the mean of its divisors is an integer number (8996843529).

Almost surely, 2^17993687057 is an apocalyptic number.

It is an amenable number.

17993687057 is a deficient number, since it is larger than the sum of its proper divisors (1).

17993687057 is an equidigital number, since it uses as much as digits as its factorization.

17993687057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20003760, while the sum is 62.

The spelling of 17993687057 in words is "seventeen billion, nine hundred ninety-three million, six hundred eighty-seven thousand, fifty-seven".