12601830865661 has 4 divisors (see below), whose sum is σ = 12638147381472. Its totient is φ = 12565514349852.

The previous prime is 12601830865643. The next prime is 12601830865681. The reversal of 12601830865661 is 16656803810621.

It is a happy number.

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.

It is not a de Polignac number, because 12601830865661 - 2³⁰ = 12600757123837 is a prime.

It is a super-2 number, since 2×12601830865661² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12601830865601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18158257385 + ... + 18158258078.

It is an arithmetic number, because the mean of its divisors is an integer number (3159536845368).

Almost surely, 2^{12601830865661} is an apocalyptic number.

It is an amenable number.

12601830865661 is a deficient number, since it is larger than the sum of its proper divisors (36316515811).

12601830865661 is an equidigital number, since it uses as much as digits as its factorization.

12601830865661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36316515810.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 12601830865661 in words is "twelve trillion, six hundred one billion, eight hundred thirty million, eight hundred sixty-five thousand, six hundred sixty-one".