17120547257 has 4 divisors (see below), whose sum is σ = 18676960656. Its totient is φ = 15564133860.

The previous prime is 17120547247. The next prime is 17120547259. The reversal of 17120547257 is 75274502171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75274502171 = 11 ⋅6843136561.

It is not a de Polignac number, because 17120547257 - 2⁸ = 17120547001 is a prime.

It is a super-2 number, since 2×17120547257² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17120547259) 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, 778206683 + ... + 778206704.

It is an arithmetic number, because the mean of its divisors is an integer number (4669240164).

Almost surely, 2^17120547257 is an apocalyptic number.

It is an amenable number.

17120547257 is a deficient number, since it is larger than the sum of its proper divisors (1556413399).

17120547257 is a wasteful number, since it uses less digits than its factorization.

17120547257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556413398.

The product of its (nonzero) digits is 137200, while the sum is 41.

The spelling of 17120547257 in words is "seventeen billion, one hundred twenty million, five hundred forty-seven thousand, two hundred fifty-seven".