16561054015 has 32 divisors (see below), whose sum is σ = 21907296000. Its totient is φ = 12017855520.

The previous prime is 16561054009. The next prime is 16561054121. The reversal of 16561054015 is 51045016561.

It is not a de Polignac number, because 16561054015 - 2²¹ = 16558956863 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3318352 + ... + 3323338.

It is an arithmetic number, because the mean of its divisors is an integer number (684603000).

Almost surely, 2^16561054015 is an apocalyptic number.

16561054015 is a deficient number, since it is larger than the sum of its proper divisors (5346241985).

16561054015 is an equidigital number, since it uses as much as digits as its factorization.

16561054015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524 (or 5502 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 16561054015 in words is "sixteen billion, five hundred sixty-one million, fifty-four thousand, fifteen".