1643932939772 has 12 divisors (see below), whose sum is σ = 2878713898536. Its totient is φ = 821443254480.

The previous prime is 1643932939771. The next prime is 1643932939799. The reversal of 1643932939772 is 2779392393461.

It is a junction number, because it is equal to n+sod(n) for n = 1643932939699 and 1643932939708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643932939771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130796783 + ... + 130809350.

It is an arithmetic number, because the mean of its divisors is an integer number (239892824878).

Almost surely, 2^{1643932939772} is an apocalyptic number.

It is an amenable number.

1643932939772 is a deficient number, since it is larger than the sum of its proper divisors (1234780958764).

1643932939772 is a wasteful number, since it uses less digits than its factorization.

1643932939772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261607708 (or 261607706 counting only the distinct ones).

The product of its digits is 92588832, while the sum is 65.

The spelling of 1643932939772 in words is "one trillion, six hundred forty-three billion, nine hundred thirty-two million, nine hundred thirty-nine thousand, seven hundred seventy-two".