17638713497 has 2 divisors, whose sum is σ = 17638713498. Its totient is φ = 17638713496.

The previous prime is 17638713451. The next prime is 17638713503. The reversal of 17638713497 is 79431783671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17397346201 + 241367296 = 131899^2 + 15536^2 .

It is a cyclic number.

It is not a de Polignac number, because 17638713497 - 2¹⁰ = 17638712473 is a prime.

It is a super-2 number, since 2×17638713497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17638713437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8819356748 + 8819356749.

It is an arithmetic number, because the mean of its divisors is an integer number (8819356749).

Almost surely, 2^17638713497 is an apocalyptic number.

It is an amenable number.

17638713497 is a deficient number, since it is larger than the sum of its proper divisors (1).

17638713497 is an equidigital number, since it uses as much as digits as its factorization.

17638713497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 56.

The spelling of 17638713497 in words is "seventeen billion, six hundred thirty-eight million, seven hundred thirteen thousand, four hundred ninety-seven".