17980999557 has 16 divisors (see below), whose sum is σ = 24665838912. Its totient is φ = 11642883840.

The previous prime is 17980999549. The next prime is 17980999613. The reversal of 17980999557 is 75599908971.

It is not a de Polignac number, because 17980999557 - 2³ = 17980999549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17980999491 and 17980999500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17980994557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78468 + ... + 205229.

It is an arithmetic number, because the mean of its divisors is an integer number (1541614932).

Almost surely, 2^17980999557 is an apocalyptic number.

It is an amenable number.

17980999557 is a deficient number, since it is larger than the sum of its proper divisors (6684839355).

17980999557 is a wasteful number, since it uses less digits than its factorization.

17980999557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284308.

The product of its (nonzero) digits is 64297800, while the sum is 69.

The spelling of 17980999557 in words is "seventeen billion, nine hundred eighty million, nine hundred ninety-nine thousand, five hundred fifty-seven".