12920782668 has 24 divisors (see below), whose sum is σ = 30164505840. Its totient is φ = 4304640000.

The previous prime is 12920782661. The next prime is 12920782727. The reversal of 12920782668 is 86628702921.

It is a self number, because there is not a number n which added to its sum of digits gives 12920782668.

It is not an unprimeable number, because it can be changed into a prime (12920782661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262333 + ... + 307668.

It is an arithmetic number, because the mean of its divisors is an integer number (1256854410).

Almost surely, 2^12920782668 is an apocalyptic number.

It is an amenable number.

12920782668 is an abundant number, since it is smaller than the sum of its proper divisors (17243723172).

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

12920782668 is a wasteful number, since it uses less digits than its factorization.

12920782668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571897 (or 571895 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 12920782668 in words is "twelve billion, nine hundred twenty million, seven hundred eighty-two thousand, six hundred sixty-eight".