12478128866 has 64 divisors (see below), whose sum is σ = 23320313856. Its totient is φ = 4890283200.

The previous prime is 12478128863. The next prime is 12478128869. The reversal of 12478128866 is 66882187421.

It is an interprime number because it is at equal distance from previous prime (12478128863) and next prime (12478128869).

It is not an unprimeable number, because it can be changed into a prime (12478128863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 820976 + ... + 836036.

It is an arithmetic number, because the mean of its divisors is an integer number (364379904).

Almost surely, 2^12478128866 is an apocalyptic number.

12478128866 is a deficient number, since it is larger than the sum of its proper divisors (10842184990).

12478128866 is a wasteful number, since it uses less digits than its factorization.

12478128866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15207.

The product of its digits is 2064384, while the sum is 53.

The spelling of 12478128866 in words is "twelve billion, four hundred seventy-eight million, one hundred twenty-eight thousand, eight hundred sixty-six".