2145431550545 has 8 divisors (see below), whose sum is σ = 2587586480424. Its totient is φ = 1707632827264.

The previous prime is 2145431550533. The next prime is 2145431550547. The reversal of 2145431550545 is 5450551345412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1383707568721 + 761723981824 = 1176311^2 + 872768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145431550545 - 2⁶ = 2145431550481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145431550496 and 2145431550505.

It is not an unprimeable number, because it can be changed into a prime (2145431550547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089050564 + ... + 1089052533.

It is an arithmetic number, because the mean of its divisors is an integer number (323448310053).

Almost surely, 2^{2145431550545} is an apocalyptic number.

It is an amenable number.

2145431550545 is a deficient number, since it is larger than the sum of its proper divisors (442154929879).

2145431550545 is a wasteful number, since it uses less digits than its factorization.

2145431550545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178103299.

The product of its (nonzero) digits is 1200000, while the sum is 44.

Adding to 2145431550545 its reverse (5450551345412), we get a palindrome (7595982895957).

The spelling of 2145431550545 in words is "two trillion, one hundred forty-five billion, four hundred thirty-one million, five hundred fifty thousand, five hundred forty-five".