12722345581 has 4 divisors (see below), whose sum is σ = 13878922464. Its totient is φ = 11565768700.

The previous prime is 12722345579. The next prime is 12722345593. The reversal of 12722345581 is 18554322721.

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 not a de Polignac number, because 12722345581 - 2¹ = 12722345579 is a prime.

It is a super-2 number, since 2×12722345581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12722345521) 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, 578288425 + ... + 578288446.

It is an arithmetic number, because the mean of its divisors is an integer number (3469730616).

Almost surely, 2^12722345581 is an apocalyptic number.

12722345581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12722345581 is a deficient number, since it is larger than the sum of its proper divisors (1156576883).

12722345581 is a wasteful number, since it uses less digits than its factorization.

12722345581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156576882.

The product of its digits is 134400, while the sum is 40.

The spelling of 12722345581 in words is "twelve billion, seven hundred twenty-two million, three hundred forty-five thousand, five hundred eighty-one".