561525316123 has 4 divisors (see below), whose sum is σ = 561557963080. Its totient is φ = 561492669168.

The previous prime is 561525316091. The next prime is 561525316141. The reversal of 561525316123 is 321613525165.

It is a happy number.

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 561525316123 - 2⁵ = 561525316091 is a prime.

It is a super-2 number, since 2×561525316123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561525316523) 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, 16297665 + ... + 16332082.

It is an arithmetic number, because the mean of its divisors is an integer number (140389490770).

Almost surely, 2^561525316123 is an apocalyptic number.

561525316123 is a deficient number, since it is larger than the sum of its proper divisors (32646957).

561525316123 is a wasteful number, since it uses less digits than its factorization.

561525316123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32646956.

The product of its digits is 162000, while the sum is 40.

The spelling of 561525316123 in words is "five hundred sixty-one billion, five hundred twenty-five million, three hundred sixteen thousand, one hundred twenty-three".