12664550420 has 48 divisors (see below), whose sum is σ = 26705963088. Its totient is φ = 5044838400.

The previous prime is 12664550369. The next prime is 12664550429. The reversal of 12664550420 is 2405546621.

It can be written as a sum of positive squares in 8 ways, for example, as 235868164 + 12428682256 = 15358^2 + 111484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664550429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7642232 + ... + 7643888.

It is an arithmetic number, because the mean of its divisors is an integer number (556374231).

Almost surely, 2^12664550420 is an apocalyptic number.

12664550420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12664550420 is an abundant number, since it is smaller than the sum of its proper divisors (14041412668).

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

12664550420 is a wasteful number, since it uses less digits than its factorization.

12664550420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 12664550420 in words is "twelve billion, six hundred sixty-four million, five hundred fifty thousand, four hundred twenty".