1616550561 has 16 divisors (see below), whose sum is σ = 2499016320. Its totient is φ = 1030843440.

The previous prime is 1616550517. The next prime is 1616550563. The reversal of 1616550561 is 1650556161.

It is not a de Polignac number, because 1616550561 - 2⁶ = 1616550497 is a prime.

It is a super-2 number, since 2×1616550561² = 5226471432538829442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1616550563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1300950 + ... + 1302191.

It is an arithmetic number, because the mean of its divisors is an integer number (156188520).

Almost surely, 2^1616550561 is an apocalyptic number.

It is an amenable number.

1616550561 is a deficient number, since it is larger than the sum of its proper divisors (882465759).

1616550561 is a wasteful number, since it uses less digits than its factorization.

1616550561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603173 (or 2603167 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1616550561 is about 40206.3497597084. The cubic root of 1616550561 is about 1173.6261137606.

The spelling of 1616550561 in words is "one billion, six hundred sixteen million, five hundred fifty thousand, five hundred sixty-one".