12581766220 has 24 divisors (see below), whose sum is σ = 26440899408. Its totient is φ = 5029051200.

The previous prime is 12581766217. The next prime is 12581766233. The reversal of 12581766220 is 2266718521.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200146 + ... + 255385.

It is an arithmetic number, because the mean of its divisors is an integer number (1101704142).

Almost surely, 2^12581766220 is an apocalyptic number.

12581766220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12581766220 is an abundant number, since it is smaller than the sum of its proper divisors (13859133188).

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

12581766220 is a wasteful number, since it uses less digits than its factorization.

12581766220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456921 (or 456919 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 12581766220 in words is "twelve billion, five hundred eighty-one million, seven hundred sixty-six thousand, two hundred twenty".