12050138911561 has 3 divisors (see below), whose sum is σ = 12050142382893. Its totient is φ = 12050135440230.

The previous prime is 12050138911541. The next prime is 12050138911627. The reversal of 12050138911561 is 16511983105021.

The square root of 12050138911561 is 3471331.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12050138911561 - 2¹¹ = 12050138909513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12050138911541) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1735666 + ... + 5206996.

It is an arithmetic number, because the mean of its divisors is an integer number (4016714127631).

Almost surely, 2^{12050138911561} is an apocalyptic number.

12050138911561 is the 3471331-st square number.

12050138911561 is the 1735666-th centered octagonal number.

It is an amenable number.

12050138911561 is a deficient number, since it is larger than the sum of its proper divisors (3471332).

12050138911561 is an frugal number, since it uses more digits than its factorization.

12050138911561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942662 (or 3471331 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 43.

The spelling of 12050138911561 in words is "twelve trillion, fifty billion, one hundred thirty-eight million, nine hundred eleven thousand, five hundred sixty-one".