1561552036123 has 4 divisors (see below), whose sum is σ = 1561576675168. Its totient is φ = 1561527397080.

The previous prime is 1561552036063. The next prime is 1561552036153. The reversal of 1561552036123 is 3216302551651.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561552036123 is a prime.

It is a super-2 number, since 2×1561552036123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561552036153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12224211 + ... + 12351292.

It is an arithmetic number, because the mean of its divisors is an integer number (390394168792).

Almost surely, 2^{1561552036123} is an apocalyptic number.

1561552036123 is a deficient number, since it is larger than the sum of its proper divisors (24639045).

1561552036123 is an equidigital number, since it uses as much as digits as its factorization.

1561552036123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24639044.

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

Adding to 1561552036123 its reverse (3216302551651), we get a palindrome (4777854587774).

The spelling of 1561552036123 in words is "one trillion, five hundred sixty-one billion, five hundred fifty-two million, thirty-six thousand, one hundred twenty-three".