65506545 has 24 divisors (see below), whose sum is σ = 122279976. Its totient is φ = 32249088.

The previous prime is 65506537. The next prime is 65506549. The reversal of 65506545 is 54560556.

It is a happy number.

65506545 is a `hidden beast` number, since 6 + 550 + 65 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3538161 + 61968384 = 1881^2 + 7872^2 .

It is not a de Polignac number, because 65506545 - 2³ = 65506537 is a prime.

It is a super-2 number, since 2×65506545² = 8582214875674050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65506549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55404 + ... + 56573.

It is an arithmetic number, because the mean of its divisors is an integer number (5094999).

Almost surely, 2^65506545 is an apocalyptic number.

65506545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65506545 is a deficient number, since it is larger than the sum of its proper divisors (56773431).

65506545 is a wasteful number, since it uses less digits than its factorization.

65506545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112001 (or 111998 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 65506545 is about 8093.6113694691. The cubic root of 65506545 is about 403.1143249382.

The spelling of 65506545 in words is "sixty-five million, five hundred six thousand, five hundred forty-five".