1645934229712 has 20 divisors (see below), whose sum is σ = 3220571806596. Its totient is φ = 814818924800.

The previous prime is 1645934229691. The next prime is 1645934229713. The reversal of 1645934229712 is 2179224395461.

It can be written as a sum of positive squares in 2 ways, for example, as 1605451180096 + 40483049616 = 1267064^2 + 201204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645934229713) 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, 509260213 + ... + 509263444.

Almost surely, 2^{1645934229712} is an apocalyptic number.

It is an amenable number.

1645934229712 is a deficient number, since it is larger than the sum of its proper divisors (1574637576884).

1645934229712 is a wasteful number, since it uses less digits than its factorization.

1645934229712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018523766 (or 1018523760 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 1645934229712 in words is "one trillion, six hundred forty-five billion, nine hundred thirty-four million, two hundred twenty-nine thousand, seven hundred twelve".