4445645123 has 4 divisors (see below), whose sum is σ = 4445779920. Its totient is φ = 4445510328.

The previous prime is 4445645119. The next prime is 4445645143. The reversal of 4445645123 is 3215465444.

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 a cyclic number.

It is not a de Polignac number, because 4445645123 - 2² = 4445645119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4445645143) 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, 18938 + ... + 96176.

It is an arithmetic number, because the mean of its divisors is an integer number (1111444980).

Almost surely, 2^4445645123 is an apocalyptic number.

4445645123 is a deficient number, since it is larger than the sum of its proper divisors (134797).

4445645123 is an equidigital number, since it uses as much as digits as its factorization.

4445645123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134796.

The product of its digits is 230400, while the sum is 38.

The square root of 4445645123 is about 66675.6711477282. The cubic root of 4445645123 is about 1644.2894259539.

The spelling of 4445645123 in words is "four billion, four hundred forty-five million, six hundred forty-five thousand, one hundred twenty-three".