561378237318 has 48 divisors (see below), whose sum is σ = 1289534328576. Its totient is φ = 175890750720.

The previous prime is 561378237317. The next prime is 561378237319. The reversal of 561378237318 is 813732873165.

It is a happy number.

561378237318 is a `hidden beast` number, since 5 + 6 + 1 + 378 + 237 + 31 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (561378237317) and next prime (561378237319).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561378237311) 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, 950118 + ... + 1423193.

It is an arithmetic number, because the mean of its divisors is an integer number (26865298512).

Almost surely, 2^561378237318 is an apocalyptic number.

561378237318 is an abundant number, since it is smaller than the sum of its proper divisors (728156091258).

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

561378237318 is a wasteful number, since it uses less digits than its factorization.

561378237318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374109 (or 2374106 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 561378237318 in words is "five hundred sixty-one billion, three hundred seventy-eight million, two hundred thirty-seven thousand, three hundred eighteen".