561011207623 has 16 divisors (see below), whose sum is σ = 571455612000. Its totient is φ = 550608468480.

The previous prime is 561011207621. The next prime is 561011207671. The reversal of 561011207623 is 326702110165.

It is a cyclic number.

It is not a de Polignac number, because 561011207623 - 2¹ = 561011207621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561011207621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56497323 + ... + 56507251.

It is an arithmetic number, because the mean of its divisors is an integer number (35715975750).

Almost surely, 2^561011207623 is an apocalyptic number.

561011207623 is a deficient number, since it is larger than the sum of its proper divisors (10444404377).

561011207623 is a wasteful number, since it uses less digits than its factorization.

561011207623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11922.

The product of its (nonzero) digits is 15120, while the sum is 34.

Adding to 561011207623 its reverse (326702110165), we get a palindrome (887713317788).

The spelling of 561011207623 in words is "five hundred sixty-one billion, eleven million, two hundred seven thousand, six hundred twenty-three".