561477389760 has 448 divisors, whose sum is σ = 2309945088000. Its totient is φ = 128337011712.

The previous prime is 561477389687. The next prime is 561477389761. The reversal of 561477389760 is 67983774165.

561477389760 is a `hidden beast` number, since 5 + 61 + 477 + 38 + 9 + 76 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561477389761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2868789 + ... + 3058251.

Almost surely, 2^561477389760 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 561477389760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1154972544000).

561477389760 is an abundant number, since it is smaller than the sum of its proper divisors (1748467698240).

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

561477389760 is a wasteful number, since it uses less digits than its factorization.

561477389760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189510 (or 189480 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 63.

The spelling of 561477389760 in words is "five hundred sixty-one billion, four hundred seventy-seven million, three hundred eighty-nine thousand, seven hundred sixty".