12721652658 has 96 divisors (see below), whose sum is σ = 32510080512. Its totient is φ = 3544473600.

The previous prime is 12721652627. The next prime is 12721652677. The reversal of 12721652658 is 85625612721.

12721652658 is a `hidden beast` number, since 1 + 2 + 72 + 1 + 6 + 526 + 58 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 651903 + ... + 671133.

It is an arithmetic number, because the mean of its divisors is an integer number (338646672).

Almost surely, 2^12721652658 is an apocalyptic number.

12721652658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12721652658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16255040256).

12721652658 is an abundant number, since it is smaller than the sum of its proper divisors (19788427854).

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

12721652658 is a wasteful number, since it uses less digits than its factorization.

12721652658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19520 (or 19517 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 12721652658 in words is "twelve billion, seven hundred twenty-one million, six hundred fifty-two thousand, six hundred fifty-eight".