16561106655 has 16 divisors (see below), whose sum is σ = 26500608000. Its totient is φ = 8831644448.

The previous prime is 16561106651. The next prime is 16561106693. The reversal of 16561106655 is 55660116561.

It is a cyclic number.

It is not a de Polignac number, because 16561106655 - 2² = 16561106651 is a prime.

It is a super-3 number, since 3×16561106655³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561106651) 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, 99346 + ... + 207344.

It is an arithmetic number, because the mean of its divisors is an integer number (1656288000).

Almost surely, 2^16561106655 is an apocalyptic number.

16561106655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16561106655 is a deficient number, since it is larger than the sum of its proper divisors (9939501345).

16561106655 is a wasteful number, since it uses less digits than its factorization.

16561106655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118230.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 16561106655 in words is "sixteen billion, five hundred sixty-one million, one hundred six thousand, six hundred fifty-five".