561557116428 has 96 divisors (see below), whose sum is σ = 1635698577408. Its totient is φ = 145673467200.

The previous prime is 561557116427. The next prime is 561557116457. The reversal of 561557116428 is 824611755165.

It is not an unprimeable number, because it can be changed into a prime (561557116427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341073 + ... + 1113303.

It is an arithmetic number, because the mean of its divisors is an integer number (17038526848).

Almost surely, 2^561557116428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561557116428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817849288704).

561557116428 is an abundant number, since it is smaller than the sum of its proper divisors (1074141460980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561557116428 is a wasteful number, since it uses less digits than its factorization.

561557116428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773043 (or 773041 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 51.

The spelling of 561557116428 in words is "five hundred sixty-one billion, five hundred fifty-seven million, one hundred sixteen thousand, four hundred twenty-eight".