561961948550 has 24 divisors (see below), whose sum is σ = 1056024998616. Its totient is φ = 222467408640.

The previous prime is 561961948547. The next prime is 561961948567. The reversal of 561961948550 is 55849169165.

It is a happy number.

It is a super-2 number, since 2×561961948550² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561961948550.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 57929372 + ... + 57939071.

It is an arithmetic number, because the mean of its divisors is an integer number (44001041609).

Almost surely, 2^561961948550 is an apocalyptic number.

561961948550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561961948550 is a deficient number, since it is larger than the sum of its proper divisors (494063050066).

561961948550 is a wasteful number, since it uses less digits than its factorization.

561961948550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115868552 (or 115868547 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 59.

The spelling of 561961948550 in words is "five hundred sixty-one billion, nine hundred sixty-one million, nine hundred forty-eight thousand, five hundred fifty".