16551561041 has 4 divisors (see below), whose sum is σ = 16612637184. Its totient is φ = 16490484900.

The previous prime is 16551561023. The next prime is 16551561053. The reversal of 16551561041 is 14016515561.

It is a happy number.

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 16551561041 - 2¹⁰ = 16551560017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16551560992 and 16551561010.

It is not an unprimeable number, because it can be changed into a prime (16551561071) 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, 30537665 + ... + 30538206.

It is an arithmetic number, because the mean of its divisors is an integer number (4153159296).

Almost surely, 2^16551561041 is an apocalyptic number.

It is an amenable number.

16551561041 is a deficient number, since it is larger than the sum of its proper divisors (61076143).

16551561041 is an equidigital number, since it uses as much as digits as its factorization.

16551561041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61076142.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 16551561041 in words is "sixteen billion, five hundred fifty-one million, five hundred sixty-one thousand, forty-one".