12923356338649 has 3 divisors (see below), whose sum is σ = 12923359933557. Its totient is φ = 12923352743742.

The previous prime is 12923356338643. The next prime is 12923356338707. The reversal of 12923356338649 is 94683365332921.

The square root of 12923356338649 is 3594907.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12923356338649 - 2¹³ = 12923356330457 is a prime.

It is a super-2 number, since 2×12923356338649² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12923356338643) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1797454 + ... + 5392360.

It is an arithmetic number, because the mean of its divisors is an integer number (4307786644519).

Almost surely, 2^{12923356338649} is an apocalyptic number.

12923356338649 is the 3594907-th square number.

12923356338649 is the 1797454-th centered octagonal number.

It is an amenable number.

12923356338649 is a deficient number, since it is larger than the sum of its proper divisors (3594908).

12923356338649 is an frugal number, since it uses more digits than its factorization.

12923356338649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7189814 (or 3594907 counting only the distinct ones).

The product of its digits is 151165440, while the sum is 64.

Multiplying 12923356338649 by its sum of digits (64), we get a square (827094805673536 = 28759256²).

The spelling of 12923356338649 in words is "twelve trillion, nine hundred twenty-three billion, three hundred fifty-six million, three hundred thirty-eight thousand, six hundred forty-nine".