12781716786790 has 32 divisors (see below), whose sum is σ = 26364310251840. Its totient is φ = 4370554088064.

The previous prime is 12781716786767. The next prime is 12781716786799. The reversal of 12781716786790 is 9768761718721.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781716786799) 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, 244740585 + ... + 244792804.

It is an arithmetic number, because the mean of its divisors is an integer number (823884695370).

Almost surely, 2^{12781716786790} is an apocalyptic number.

12781716786790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12781716786790 is an abundant number, since it is smaller than the sum of its proper divisors (13582593465050).

12781716786790 is a wasteful number, since it uses less digits than its factorization.

12781716786790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489533776.

The product of its (nonzero) digits is 99574272, while the sum is 70.

The spelling of 12781716786790 in words is "twelve trillion, seven hundred eighty-one billion, seven hundred sixteen million, seven hundred eighty-six thousand, seven hundred ninety".