65671945 has 4 divisors (see below), whose sum is σ = 78806340. Its totient is φ = 52537552.

The previous prime is 65671927. The next prime is 65671951. The reversal of 65671945 is 54917656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17397241 + 48274704 = 4171^2 + 6948^2 .

It is a cyclic number.

It is not a de Polignac number, because 65671945 - 2⁵ = 65671913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6567190 + ... + 6567199.

It is an arithmetic number, because the mean of its divisors is an integer number (19701585).

Almost surely, 2^65671945 is an apocalyptic number.

It is an amenable number.

65671945 is a deficient number, since it is larger than the sum of its proper divisors (13134395).

65671945 is a wasteful number, since it uses less digits than its factorization.

65671945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13134394.

The product of its digits is 226800, while the sum is 43.

The square root of 65671945 is about 8103.8228633158. The cubic root of 65671945 is about 403.4533194161.

The spelling of 65671945 in words is "sixty-five million, six hundred seventy-one thousand, nine hundred forty-five".