17120521640 has 16 divisors (see below), whose sum is σ = 38521173780. Its totient is φ = 6848208640.

The previous prime is 17120521603. The next prime is 17120521679. The reversal of 17120521640 is 4612502171.

It can be written as a sum of positive squares in 2 ways, for example, as 17039125156 + 81396484 = 130534^2 + 9022^2 .

It is a super-2 number, since 2×17120521640² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214006481 + ... + 214006560.

Almost surely, 2^17120521640 is an apocalyptic number.

17120521640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17120521640 is an abundant number, since it is smaller than the sum of its proper divisors (21400652140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17120521640 is a wasteful number, since it uses less digits than its factorization.

17120521640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428013052 (or 428013048 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 17120521640 in words is "seventeen billion, one hundred twenty million, five hundred twenty-one thousand, six hundred forty".