12721554660 has 24 divisors (see below), whose sum is σ = 35620353216. Its totient is φ = 3392414560.

The previous prime is 12721554653. The next prime is 12721554673. The reversal of 12721554660 is 6645512721.

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, 106012896 + ... + 106013015.

It is an arithmetic number, because the mean of its divisors is an integer number (1484181384).

Almost surely, 2^12721554660 is an apocalyptic number.

12721554660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12721554660 is an abundant number, since it is smaller than the sum of its proper divisors (22898798556).

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

12721554660 is a wasteful number, since it uses less digits than its factorization.

12721554660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212025923 (or 212025921 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 12721554660 in words is "twelve billion, seven hundred twenty-one million, five hundred fifty-four thousand, six hundred sixty".