561678338903 has 24 divisors (see below), whose sum is σ = 651513789360. Its totient is φ = 482522832000.

The previous prime is 561678338899. The next prime is 561678338909. The reversal of 561678338903 is 309833876165.

It is a happy number.

It is not a de Polignac number, because 561678338903 - 2² = 561678338899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561678338909) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 605003 + ... + 1220403.

It is an arithmetic number, because the mean of its divisors is an integer number (27146407890).

Almost surely, 2^561678338903 is an apocalyptic number.

561678338903 is a deficient number, since it is larger than the sum of its proper divisors (89835450457).

561678338903 is a wasteful number, since it uses less digits than its factorization.

561678338903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615839 (or 615828 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 59.

The spelling of 561678338903 in words is "five hundred sixty-one billion, six hundred seventy-eight million, three hundred thirty-eight thousand, nine hundred three".