12664222340 has 96 divisors (see below), whose sum is σ = 33485937408. Its totient is φ = 3908160000.

The previous prime is 12664222289. The next prime is 12664222381. The reversal of 12664222340 is 4322246621.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12664222297 and 12664222306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114830 + ... + 196250.

It is an arithmetic number, because the mean of its divisors is an integer number (348811848).

Almost surely, 2^12664222340 is an apocalyptic number.

12664222340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12664222340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16742968704).

12664222340 is an abundant number, since it is smaller than the sum of its proper divisors (20821715068).

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

12664222340 is a wasteful number, since it uses less digits than its factorization.

12664222340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81549 (or 81547 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 12664222340 its reverse (4322246621), we get a palindrome (16986468961).

The spelling of 12664222340 in words is "twelve billion, six hundred sixty-four million, two hundred twenty-two thousand, three hundred forty".