17640057137 has 4 divisors (see below), whose sum is σ = 18116815476. Its totient is φ = 17163298800.

The previous prime is 17640057133. The next prime is 17640057179. The reversal of 17640057137 is 73175004671.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16230505201 + 1409551936 = 127399^2 + 37544^2 .

It is a cyclic number.

It is not a de Polignac number, because 17640057137 - 2² = 17640057133 is a prime.

It is a super-2 number, since 2×17640057137² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17640057094 and 17640057103.

It is not an unprimeable number, because it can be changed into a prime (17640057133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238379114 + ... + 238379187.

It is an arithmetic number, because the mean of its divisors is an integer number (4529203869).

Almost surely, 2^17640057137 is an apocalyptic number.

It is an amenable number.

17640057137 is a deficient number, since it is larger than the sum of its proper divisors (476758339).

17640057137 is an equidigital number, since it uses as much as digits as its factorization.

17640057137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476758338.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 17640057137 in words is "seventeen billion, six hundred forty million, fifty-seven thousand, one hundred thirty-seven".