12345666654320 has 80 divisors (see below), whose sum is σ = 28729635709440. Its totient is φ = 4933802016000.

The previous prime is 12345666654311. The next prime is 12345666654331. The reversal of 12345666654320 is 2345666654321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 606388301 + ... + 606408659.

It is an arithmetic number, because the mean of its divisors is an integer number (359120446368).

Almost surely, 2^{12345666654320} is an apocalyptic number.

12345666654320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12345666654320 is an abundant number, since it is smaller than the sum of its proper divisors (16383969055120).

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

12345666654320 is a wasteful number, since it uses less digits than its factorization.

12345666654320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26854 (or 26848 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 53.

Subtracting from 12345666654320 its reverse (2345666654321), we obtain a palindrome (9999999999999).

The spelling of 12345666654320 in words is "twelve trillion, three hundred forty-five billion, six hundred sixty-six million, six hundred fifty-four thousand, three hundred twenty".