12605040421601 has 4 divisors (see below), whose sum is σ = 12644803956372. Its totient is φ = 12565276886832.

The previous prime is 12605040421553. The next prime is 12605040421639. The reversal of 12605040421601 is 10612404050621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7670955583201 + 4934084838400 = 2769649^2 + 2221280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12605040421601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12605040921601) 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, 19881766910 + ... + 19881767543.

It is an arithmetic number, because the mean of its divisors is an integer number (3161200989093).

Almost surely, 2^{12605040421601} is an apocalyptic number.

It is an amenable number.

12605040421601 is a deficient number, since it is larger than the sum of its proper divisors (39763534771).

12605040421601 is an equidigital number, since it uses as much as digits as its factorization.

12605040421601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39763534770.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 12605040421601 in words is "twelve trillion, six hundred five billion, forty million, four hundred twenty-one thousand, six hundred one".