12611655620 has 12 divisors (see below), whose sum is σ = 26484476844. Its totient is φ = 5044662240.

The previous prime is 12611655607. The next prime is 12611655629. The reversal of 12611655620 is 2655611621.

It can be written as a sum of positive squares in 2 ways, for example, as 1463674564 + 11147981056 = 38258^2 + 105584^2 .

It is not an unprimeable number, because it can be changed into a prime (12611655629) 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, 315291371 + ... + 315291410.

It is an arithmetic number, because the mean of its divisors is an integer number (2207039737).

Almost surely, 2^12611655620 is an apocalyptic number.

12611655620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12611655620 is an abundant number, since it is smaller than the sum of its proper divisors (13872821224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12611655620 is a wasteful number, since it uses less digits than its factorization.

12611655620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630582790 (or 630582788 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 12611655620 in words is "twelve billion, six hundred eleven million, six hundred fifty-five thousand, six hundred twenty".