561155963520 has 256 divisors, whose sum is σ = 1819258030080. Its totient is φ = 147096391680.

The previous prime is 561155963519. The next prime is 561155963521. The reversal of 561155963520 is 25369551165.

It is an interprime number because it is at equal distance from previous prime (561155963519) and next prime (561155963521).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 561155963520.

It is not an unprimeable number, because it can be changed into a prime (561155963521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47297109 + ... + 47308971.

It is an arithmetic number, because the mean of its divisors is an integer number (7106476680).

Almost surely, 2^561155963520 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 561155963520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909629015040).

561155963520 is an abundant number, since it is smaller than the sum of its proper divisors (1258102066560).

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

561155963520 is a wasteful number, since it uses less digits than its factorization.

561155963520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12303 (or 12291 counting only the distinct ones).

The product of its (nonzero) digits is 1215000, while the sum is 48.

The spelling of 561155963520 in words is "five hundred sixty-one billion, one hundred fifty-five million, nine hundred sixty-three thousand, five hundred twenty".