12978991782890 has 32 divisors (see below), whose sum is σ = 26859518348544. Its totient is φ = 4423293688320.

The previous prime is 12978991782851. The next prime is 12978991782899. The reversal of 12978991782890 is 9828719987921.

It is a super-2 number, since 2×12978991782890² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12978991782899) 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, 555120551 + ... + 555143930.

It is an arithmetic number, because the mean of its divisors is an integer number (839359948392).

Almost surely, 2^{12978991782890} is an apocalyptic number.

12978991782890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12978991782890 is an abundant number, since it is smaller than the sum of its proper divisors (13880526565654).

12978991782890 is a wasteful number, since it uses less digits than its factorization.

12978991782890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110264662.

The product of its (nonzero) digits is 658409472, while the sum is 80.

The spelling of 12978991782890 in words is "twelve trillion, nine hundred seventy-eight billion, nine hundred ninety-one million, seven hundred eighty-two thousand, eight hundred ninety".