16015601561 has 4 divisors (see below), whose sum is σ = 16018309632. Its totient is φ = 16012893492.

The previous prime is 16015601551. The next prime is 16015601599. The reversal of 16015601561 is 16510651061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16510651061 = 25633 ⋅644117.

It is a cyclic number.

It is not a de Polignac number, because 16015601561 - 2¹⁰ = 16015600537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16015601501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345145 + ... + 1356998.

It is an arithmetic number, because the mean of its divisors is an integer number (4004577408).

Almost surely, 2^16015601561 is an apocalyptic number.

It is an amenable number.

16015601561 is a deficient number, since it is larger than the sum of its proper divisors (2708071).

16015601561 is an equidigital number, since it uses as much as digits as its factorization.

16015601561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708070.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 16015601561 in words is "sixteen billion, fifteen million, six hundred one thousand, five hundred sixty-one".