12312778123500 has 48 divisors (see below), whose sum is σ = 35854809900000. Its totient is φ = 3283407499200.

The previous prime is 12312778123487. The next prime is 12312778123519. The reversal of 12312778123500 is 532187721321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4104257875 + ... + 4104260874.

It is an arithmetic number, because the mean of its divisors is an integer number (746975206250).

Almost surely, 2^{12312778123500} is an apocalyptic number.

12312778123500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312778123500 is an abundant number, since it is smaller than the sum of its proper divisors (23542031776500).

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

12312778123500 is a wasteful number, since it uses less digits than its factorization.

12312778123500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8208518771 (or 8208518759 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 12312778123500 in words is "twelve trillion, three hundred twelve billion, seven hundred seventy-eight million, one hundred twenty-three thousand, five hundred".