16551537918 has 16 divisors (see below), whose sum is σ = 34170917376. Its totient is φ = 5339205720.

The previous prime is 16551537917. The next prime is 16551537973. The reversal of 16551537918 is 81973515561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551537917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44493196 + ... + 44493567.

It is an arithmetic number, because the mean of its divisors is an integer number (2135682336).

Almost surely, 2^16551537918 is an apocalyptic number.

16551537918 is an abundant number, since it is smaller than the sum of its proper divisors (17619379458).

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

16551537918 is a wasteful number, since it uses less digits than its factorization.

16551537918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88986799.

The product of its digits is 1134000, while the sum is 51.

The spelling of 16551537918 in words is "sixteen billion, five hundred fifty-one million, five hundred thirty-seven thousand, nine hundred eighteen".