561661367948 has 48 divisors (see below), whose sum is σ = 1028140861440. Its totient is φ = 267967180800.

The previous prime is 561661367929. The next prime is 561661367959. The reversal of 561661367948 is 849763166165.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70107263 + ... + 70115273.

It is an arithmetic number, because the mean of its divisors is an integer number (21419601280).

Almost surely, 2^561661367948 is an apocalyptic number.

It is an amenable number.

561661367948 is a deficient number, since it is larger than the sum of its proper divisors (466479493492).

561661367948 is a wasteful number, since it uses less digits than its factorization.

561661367948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9798 (or 9796 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 62.

The spelling of 561661367948 in words is "five hundred sixty-one billion, six hundred sixty-one million, three hundred sixty-seven thousand, nine hundred forty-eight".