17645393893 has 2 divisors, whose sum is σ = 17645393894. Its totient is φ = 17645393892.

The previous prime is 17645393833. The next prime is 17645393903. The reversal of 17645393893 is 39839354671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12859106404 + 4786287489 = 113398^2 + 69183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17645393893 is a prime.

It is a super-2 number, since 2×17645393893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17645393833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8822696946 + 8822696947.

It is an arithmetic number, because the mean of its divisors is an integer number (8822696947).

Almost surely, 2^17645393893 is an apocalyptic number.

It is an amenable number.

17645393893 is a deficient number, since it is larger than the sum of its proper divisors (1).

17645393893 is an equidigital number, since it uses as much as digits as its factorization.

17645393893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 58.

The spelling of 17645393893 in words is "seventeen billion, six hundred forty-five million, three hundred ninety-three thousand, eight hundred ninety-three".