51545565 has 40 divisors (see below), whose sum is σ = 93174840. Its totient is φ = 27260928.

The previous prime is 51545563. The next prime is 51545567. The reversal of 51545565 is 56554515.

51545565 is a `hidden beast` number, since 51 + 5 + 45 + 565 = 666.

51545565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51545563) and next prime (51545567).

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 51451929 = 306^2 + 7173^2 .

It is not a de Polignac number, because 51545565 - 2¹ = 51545563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51545561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 55021 + ... + 55949.

It is an arithmetic number, because the mean of its divisors is an integer number (2329371).

Almost surely, 2^51545565 is an apocalyptic number.

It is an amenable number.

51545565 is a deficient number, since it is larger than the sum of its proper divisors (41629275).

51545565 is a wasteful number, since it uses less digits than its factorization.

51545565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083 (or 1074 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 51545565 is about 7179.5240092920. The cubic root of 51545565 is about 372.1606356198.

The spelling of 51545565 in words is "fifty-one million, five hundred forty-five thousand, five hundred sixty-five".