561249695556 has 81 divisors (see below), whose sum is σ = 1559550860959. Its totient is φ = 170060682000.

The previous prime is 561249695527. The next prime is 561249695569. The reversal of 561249695556 is 655596942165.

It is a happy number.

The square root of 561249695556 is 749166.

It is a perfect power (a square), and thus also a powerful number.

561249695556 is a `hidden beast` number, since 5 + 6 + 1 + 2 + 496 + 95 + 5 + 56 = 666.

It is a super-2 number, since 2×561249695556² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561249695493 and 561249695502.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 49439281 + ... + 49450631.

Almost surely, 2^561249695556 is an apocalyptic number.

561249695556 is the 749166-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561249695556

561249695556 is an abundant number, since it is smaller than the sum of its proper divisors (998301165403).

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

561249695556 is a wasteful number, since it uses less digits than its factorization.

561249695556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22734 (or 11367 counting only the distinct ones).

The product of its digits is 87480000, while the sum is 63.

The spelling of 561249695556 in words is "five hundred sixty-one billion, two hundred forty-nine million, six hundred ninety-five thousand, five hundred fifty-six".