17939163257 has 4 divisors (see below), whose sum is σ = 17979117300. Its totient is φ = 17899209216.

The previous prime is 17939163197. The next prime is 17939163269. The reversal of 17939163257 is 75236193971.

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 10175967376 + 7763195881 = 100876^2 + 88109^2 .

It is a cyclic number.

It is not a de Polignac number, because 17939163257 - 2¹⁴ = 17939146873 is a prime.

It is a super-2 number, since 2×17939163257² (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 = 17939163199 and 17939163208.

It is not an unprimeable number, because it can be changed into a prime (17939166257) 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, 19976348 + ... + 19977245.

It is an arithmetic number, because the mean of its divisors is an integer number (4494779325).

Almost surely, 2^17939163257 is an apocalyptic number.

It is an amenable number.

17939163257 is a deficient number, since it is larger than the sum of its proper divisors (39954043).

17939163257 is an equidigital number, since it uses as much as digits as its factorization.

17939163257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39954042.

The product of its digits is 2143260, while the sum is 53.

The spelling of 17939163257 in words is "seventeen billion, nine hundred thirty-nine million, one hundred sixty-three thousand, two hundred fifty-seven".