561423609987 has 4 divisors (see below), whose sum is σ = 748564813320. Its totient is φ = 374282406656.

The previous prime is 561423609947. The next prime is 561423610001. The reversal of 561423609987 is 789906324165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561423609987 - 2¹² = 561423605891 is a prime.

It is a super-2 number, since 2×561423609987² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 561423609987.

It is not an unprimeable number, because it can be changed into a prime (561423609937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93570601662 + ... + 93570601667.

It is an arithmetic number, because the mean of its divisors is an integer number (187141203330).

It is a 1-persistent number, because it is pandigital, but 2⋅561423609987 = 1122847219974 is not.

Almost surely, 2^561423609987 is an apocalyptic number.

561423609987 is a deficient number, since it is larger than the sum of its proper divisors (187141203333).

561423609987 is a wasteful number, since it uses less digits than its factorization.

561423609987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187141203332.

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 561423609987 in words is "five hundred sixty-one billion, four hundred twenty-three million, six hundred nine thousand, nine hundred eighty-seven".