16552227561 has 4 divisors (see below), whose sum is σ = 22069636752. Its totient is φ = 11034818372.

The previous prime is 16552227529. The next prime is 16552227569. The reversal of 16552227561 is 16572225561.

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.

It is a cyclic number.

It is not a de Polignac number, because 16552227561 - 2⁵ = 16552227529 is a prime.

It is a super-2 number, since 2×16552227561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16552227569) 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, 2758704591 + ... + 2758704596.

It is an arithmetic number, because the mean of its divisors is an integer number (5517409188).

Almost surely, 2^16552227561 is an apocalyptic number.

It is an amenable number.

16552227561 is a deficient number, since it is larger than the sum of its proper divisors (5517409191).

16552227561 is an equidigital number, since it uses as much as digits as its factorization.

16552227561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5517409190.

The product of its digits is 252000, while the sum is 42.

It can be divided in two parts, 1655 and 2227561, that added together give a triangular number (2229216 = T₂₁₁₁).

The spelling of 16552227561 in words is "sixteen billion, five hundred fifty-two million, two hundred twenty-seven thousand, five hundred sixty-one".