12785403776 has 16 divisors (see below), whose sum is σ = 25470921840. Its totient is φ = 6392701824.

The previous prime is 12785403773. The next prime is 12785403779. The reversal of 12785403776 is 67730458721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12785403773) and next prime (12785403779).

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12785403773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49942856 + ... + 49943111.

It is an arithmetic number, because the mean of its divisors is an integer number (1591932615).

Almost surely, 2^12785403776 is an apocalyptic number.

12785403776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12785403776 is a deficient number, since it is larger than the sum of its proper divisors (12685518064).

12785403776 is an frugal number, since it uses more digits than its factorization.

12785403776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99885981 (or 99885969 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 50.

Subtracting 12785403776 from its reverse (67730458721), we obtain a palindrome (54945054945).

The spelling of 12785403776 in words is "twelve billion, seven hundred eighty-five million, four hundred three thousand, seven hundred seventy-six".