561578077550 has 48 divisors (see below), whose sum is σ = 1196311109760. Its totient is φ = 192128705760.

The previous prime is 561578077507. The next prime is 561578077553. The reversal of 561578077550 is 55770875165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561578077553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1554440 + ... + 1881339.

It is an arithmetic number, because the mean of its divisors is an integer number (24923148120).

Almost surely, 2^561578077550 is an apocalyptic number.

561578077550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561578077550 is an abundant number, since it is smaller than the sum of its proper divisors (634733032210).

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

561578077550 is a wasteful number, since it uses less digits than its factorization.

561578077550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436265 (or 3436260 counting only the distinct ones).

The product of its (nonzero) digits is 10290000, while the sum is 56.

The spelling of 561578077550 in words is "five hundred sixty-one billion, five hundred seventy-eight million, seventy-seven thousand, five hundred fifty".