16055501561 has 8 divisors (see below), whose sum is σ = 17532672384. Its totient is φ = 14581260720.

The previous prime is 16055501549. The next prime is 16055501591. The reversal of 16055501561 is 16510555061.

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 16055501561 - 2¹⁰ = 16055500537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16055501531) 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, 721025 + ... + 742958.

It is an arithmetic number, because the mean of its divisors is an integer number (2191584048).

Almost surely, 2^16055501561 is an apocalyptic number.

16055501561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16055501561 is a deficient number, since it is larger than the sum of its proper divisors (1477170823).

16055501561 is a wasteful number, since it uses less digits than its factorization.

16055501561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464991.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 16055501561 in words is "sixteen billion, fifty-five million, five hundred one thousand, five hundred sixty-one".