16556655505 has 8 divisors (see below), whose sum is σ = 21396293352. Its totient is φ = 12226453248.

The previous prime is 16556655463. The next prime is 16556655509. The reversal of 16556655505 is 50555665561.

It can be written as a sum of positive squares in 4 ways, for example, as 773507344 + 15783148161 = 27812^2 + 125631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16556655505 - 2⁷ = 16556655377 is a prime.

It is a super-2 number, since 2×16556655505² (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 (16556655509) 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, 127358824 + ... + 127358953.

It is an arithmetic number, because the mean of its divisors is an integer number (2674536669).

Almost surely, 2^16556655505 is an apocalyptic number.

It is an amenable number.

16556655505 is a deficient number, since it is larger than the sum of its proper divisors (4839637847).

16556655505 is a wasteful number, since it uses less digits than its factorization.

16556655505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254717795.

The product of its (nonzero) digits is 3375000, while the sum is 49.

The spelling of 16556655505 in words is "sixteen billion, five hundred fifty-six million, six hundred fifty-five thousand, five hundred five".