12561054541 has 4 divisors (see below), whose sum is σ = 14355490912. Its totient is φ = 10766618172.

The previous prime is 12561054533. The next prime is 12561054551. The reversal of 12561054541 is 14545016521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14545016521 = 7 ⋅2077859503.

It is a cyclic number.

It is not a de Polignac number, because 12561054541 - 2³ = 12561054533 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 12561054497 and 12561054506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561054551) 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, 897218175 + ... + 897218188.

It is an arithmetic number, because the mean of its divisors is an integer number (3588872728).

Almost surely, 2^12561054541 is an apocalyptic number.

It is an amenable number.

12561054541 is a deficient number, since it is larger than the sum of its proper divisors (1794436371).

12561054541 is an equidigital number, since it uses as much as digits as its factorization.

12561054541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794436370.

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 12561054541 in words is "twelve billion, five hundred sixty-one million, fifty-four thousand, five hundred forty-one".