12606937561 has 4 divisors (see below), whose sum is σ = 12607996432. Its totient is φ = 12605878692.

The previous prime is 12606937559. The next prime is 12606937573. The reversal of 12606937561 is 16573960621.

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: 16573960621 = 31 ⋅534643891.

It is a cyclic number.

It is not a de Polignac number, because 12606937561 - 2¹ = 12606937559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12606937661) 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, 511371 + ... + 535456.

It is an arithmetic number, because the mean of its divisors is an integer number (3151999108).

Almost surely, 2^12606937561 is an apocalyptic number.

It is an amenable number.

12606937561 is a deficient number, since it is larger than the sum of its proper divisors (1058871).

12606937561 is a wasteful number, since it uses less digits than its factorization.

12606937561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058870.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 12606937561 in words is "twelve billion, six hundred six million, nine hundred thirty-seven thousand, five hundred sixty-one".