12653621693 has 4 divisors (see below), whose sum is σ = 12661487580. Its totient is φ = 12645755808.

The previous prime is 12653621677. The next prime is 12653621699. The reversal of 12653621693 is 39612635621.

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 11692745689 + 960876004 = 108133^2 + 30998^2 .

It is a cyclic number.

It is not a de Polignac number, because 12653621693 - 2⁴ = 12653621677 is a prime.

It is a super-2 number, since 2×12653621693² (a number of 21 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 (12653621699) 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, 3930530 + ... + 3933747.

It is an arithmetic number, because the mean of its divisors is an integer number (3165371895).

Almost surely, 2^12653621693 is an apocalyptic number.

It is an amenable number.

12653621693 is a deficient number, since it is larger than the sum of its proper divisors (7865887).

12653621693 is an equidigital number, since it uses as much as digits as its factorization.

12653621693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7865886.

The product of its digits is 349920, while the sum is 44.

The spelling of 12653621693 in words is "twelve billion, six hundred fifty-three million, six hundred twenty-one thousand, six hundred ninety-three".