17643697345 has 16 divisors (see below), whose sum is σ = 21809266128. Its totient is φ = 13692672000.

The previous prime is 17643697307. The next prime is 17643697363. The reversal of 17643697345 is 54379634671.

It can be written as a sum of positive squares in 8 ways, for example, as 488984769 + 17154712576 = 22113^2 + 130976^2 .

It is a de Polignac number, because none of the positive numbers 2^k-17643697345 is a prime.

It is a super-2 number, since 2×17643697345² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79156 + ... + 203845.

It is an arithmetic number, because the mean of its divisors is an integer number (1363079133).

Almost surely, 2^17643697345 is an apocalyptic number.

It is an amenable number.

17643697345 is a deficient number, since it is larger than the sum of its proper divisors (4165568783).

17643697345 is a wasteful number, since it uses less digits than its factorization.

17643697345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283380.

The product of its digits is 11430720, while the sum is 55.

The spelling of 17643697345 in words is "seventeen billion, six hundred forty-three million, six hundred ninety-seven thousand, three hundred forty-five".