2145543345 has 48 divisors (see below), whose sum is σ = 4117643712. Its totient is φ = 1024721280.

The previous prime is 2145543343. The next prime is 2145543353. The reversal of 2145543345 is 5433455412.

2145543345 is a `hidden beast` number, since 214 + 5 + 5 + 433 + 4 + 5 = 666.

It is not a de Polignac number, because 2145543345 - 2¹ = 2145543343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145543341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 819 + ... + 65511.

It is an arithmetic number, because the mean of its divisors is an integer number (85784244).

Almost surely, 2^2145543345 is an apocalyptic number.

It is an amenable number.

2145543345 is a deficient number, since it is larger than the sum of its proper divisors (1972100367).

2145543345 is a wasteful number, since it uses less digits than its factorization.

2145543345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64782 (or 64779 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

The square root of 2145543345 is about 46320.0102007761. The cubic root of 2145543345 is about 1289.7704747578.

Adding to 2145543345 its reverse (5433455412), we get a palindrome (7578998757).

It can be divided in two parts, 2145 and 543345, that added together give a triangular number (545490 = T₁₀₄₄).

The spelling of 2145543345 in words is "two billion, one hundred forty-five million, five hundred forty-three thousand, three hundred forty-five".