54866565 has 80 divisors (see below), whose sum is σ = 112332528. Its totient is φ = 25380864.

The previous prime is 54866563. The next prime is 54866573. The reversal of 54866565 is 56566845.

It is a happy number.

54866565 is a `hidden beast` number, since 5 + 4 + 86 + 6 + 565 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 11819844 + 43046721 = 3438^2 + 6561^2 .

It is not a de Polignac number, because 54866565 - 2¹ = 54866563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 54866565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54866561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 89199 + ... + 89811.

Almost surely, 2^54866565 is an apocalyptic number.

It is an amenable number.

54866565 is an abundant number, since it is smaller than the sum of its proper divisors (57465963).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

54866565 is a wasteful number, since it uses less digits than its factorization.

54866565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 651 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 54866565 is about 7407.1968382108. The cubic root of 54866565 is about 379.9874534177.

The spelling of 54866565 in words is "fifty-four million, eight hundred sixty-six thousand, five hundred sixty-five".