561718623312 has 240 divisors, whose sum is σ = 2025420781440. Its totient is φ = 145900846080.

The previous prime is 561718623299. The next prime is 561718623421. The reversal of 561718623312 is 213326817165.

It is a happy number.

561718623312 is a `hidden beast` number, since 5 + 6 + 1 + 7 + 1 + 8 + 623 + 3 + 12 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 401673 + ... + 1133480.

It is an arithmetic number, because the mean of its divisors is an integer number (8439253256).

Almost surely, 2^561718623312 is an apocalyptic number.

It is an amenable number.

561718623312 is an abundant number, since it is smaller than the sum of its proper divisors (1463702158128).

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

561718623312 is a wasteful number, since it uses less digits than its factorization.

561718623312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535199 (or 1535176 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

It can be divided in two parts, 561718 and 623312, that added together give a triangular number (1185030 = T₁₅₃₉).

The spelling of 561718623312 in words is "five hundred sixty-one billion, seven hundred eighteen million, six hundred twenty-three thousand, three hundred twelve".