842445561 has 16 divisors (see below), whose sum is σ = 1136332800. Its totient is φ = 555118608.

The previous prime is 842445533. The next prime is 842445581. The reversal of 842445561 is 165544248.

It is a happy number.

It is not a de Polignac number, because 842445561 - 2⁶ = 842445497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (842445511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151020 + ... + 156498.

It is an arithmetic number, because the mean of its divisors is an integer number (71020800).

Almost surely, 2^842445561 is an apocalyptic number.

It is an amenable number.

842445561 is a deficient number, since it is larger than the sum of its proper divisors (293887239).

842445561 is a wasteful number, since it uses less digits than its factorization.

842445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6068.

The product of its digits is 153600, while the sum is 39.

The square root of 842445561 is about 29024.9127647268. The cubic root of 842445561 is about 944.4535762126.

The spelling of 842445561 in words is "eight hundred forty-two million, four hundred forty-five thousand, five hundred sixty-one".