1645044115123 has 4 divisors (see below), whose sum is σ = 1731625384360. Its totient is φ = 1558462845888.

The previous prime is 1645044115103. The next prime is 1645044115153. The reversal of 1645044115123 is 3215114405461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645044115123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645044115103) 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, 43290634590 + ... + 43290634627.

It is an arithmetic number, because the mean of its divisors is an integer number (432906346090).

Almost surely, 2^{1645044115123} is an apocalyptic number.

1645044115123 is a deficient number, since it is larger than the sum of its proper divisors (86581269237).

1645044115123 is an equidigital number, since it uses as much as digits as its factorization.

1645044115123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86581269236.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 1645044115123 in words is "one trillion, six hundred forty-five billion, forty-four million, one hundred fifteen thousand, one hundred twenty-three".