65669945 has 16 divisors (see below), whose sum is σ = 89707392. Its totient is φ = 45682560.

The previous prime is 65669941. The next prime is 65669953. The reversal of 65669945 is 54996656.

It is not a de Polignac number, because 65669945 - 2² = 65669941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65669893 and 65669902.

It is not an unprimeable number, because it can be changed into a prime (65669941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24692 + ... + 27221.

It is an arithmetic number, because the mean of its divisors is an integer number (5606712).

Almost surely, 2^65669945 is an apocalyptic number.

It is an amenable number.

65669945 is a deficient number, since it is larger than the sum of its proper divisors (24037447).

65669945 is a wasteful number, since it uses less digits than its factorization.

65669945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51952.

The product of its digits is 1749600, while the sum is 50.

The square root of 65669945 is about 8103.6994638251. The cubic root of 65669945 is about 403.4492237310.

Subtracting from 65669945 its reverse (54996656), we obtain a square (10673289 = 3267²).

The spelling of 65669945 in words is "sixty-five million, six hundred sixty-nine thousand, nine hundred forty-five".