561056001100 has 36 divisors (see below), whose sum is σ = 1391418884464. Its totient is φ = 192362057280.

The previous prime is 561056001089. The next prime is 561056001101. The reversal of 561056001100 is 1100650165.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (561056001101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400753587 + ... + 400754986.

Almost surely, 2^561056001100 is an apocalyptic number.

561056001100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561056001100 is an abundant number, since it is smaller than the sum of its proper divisors (830362883364).

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

561056001100 is a wasteful number, since it uses less digits than its factorization.

561056001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801508594 (or 801508587 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 561056001100 its reverse (1100650165), we get a palindrome (562156651265).

The spelling of 561056001100 in words is "five hundred sixty-one billion, fifty-six million, one thousand, one hundred".