2145423304445 has 12 divisors (see below), whose sum is σ = 2618883303420. Its totient is φ = 1687248144384.

The previous prime is 2145423304441. The next prime is 2145423304477. The reversal of 2145423304445 is 5444033245412.

It can be written as a sum of positive squares in 2 ways, for example, as 280521707449 + 1864901596996 = 529643^2 + 1365614^2 .

It is not a de Polignac number, because 2145423304445 - 2² = 2145423304441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145423304441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61614980 + ... + 61649789.

It is an arithmetic number, because the mean of its divisors is an integer number (218240275285).

Almost surely, 2^{2145423304445} is an apocalyptic number.

It is an amenable number.

2145423304445 is a deficient number, since it is larger than the sum of its proper divisors (473459998975).

2145423304445 is an equidigital number, since it uses as much as digits as its factorization.

2145423304445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123264892 (or 123264833 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 41.

Adding to 2145423304445 its reverse (5444033245412), we get a palindrome (7589456549857).

The spelling of 2145423304445 in words is "two trillion, one hundred forty-five billion, four hundred twenty-three million, three hundred four thousand, four hundred forty-five".