2145645413123 has 4 divisors (see below), whose sum is σ = 2145956428200. Its totient is φ = 2145334398048.

The previous prime is 2145645413113. The next prime is 2145645413129. The reversal of 2145645413123 is 3213145465412.

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-2145645413123 is a prime.

It is a super-2 number, since 2×2145645413123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145645413129) 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, 155497190 + ... + 155510987.

It is an arithmetic number, because the mean of its divisors is an integer number (536489107050).

Almost surely, 2^{2145645413123} is an apocalyptic number.

2145645413123 is a deficient number, since it is larger than the sum of its proper divisors (311015077).

2145645413123 is an equidigital number, since it uses as much as digits as its factorization.

2145645413123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311015076.

The product of its digits is 345600, while the sum is 41.

The spelling of 2145645413123 in words is "two trillion, one hundred forty-five billion, six hundred forty-five million, four hundred thirteen thousand, one hundred twenty-three".