12658085621 has 4 divisors (see below), whose sum is σ = 12735742752. Its totient is φ = 12580428492.

The previous prime is 12658085603. The next prime is 12658085653.

12658085621 is nontrivially palindromic in base 10.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12658085621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12658085221) 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, 38828321 + ... + 38828646.

It is an arithmetic number, because the mean of its divisors is an integer number (3183935688).

Almost surely, 2^12658085621 is an apocalyptic number.

It is an amenable number.

12658085621 is a deficient number, since it is larger than the sum of its proper divisors (77657131).

12658085621 is an equidigital number, since it uses as much as digits as its factorization.

12658085621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77657130.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 12658085621 in words is "twelve billion, six hundred fifty-eight million, eighty-five thousand, six hundred twenty-one".