51565560 has 64 divisors (see below), whose sum is σ = 155170080. Its totient is φ = 13708800.

The previous prime is 51565543. The next prime is 51565571. The reversal of 51565560 is 6556515.

It is a super-2 number, since 2×51565560² = 5318013956227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73210 + ... + 73910.

Almost surely, 2^51565560 is an apocalyptic number.

It is an amenable number.

51565560 is an abundant number, since it is smaller than the sum of its proper divisors (103604520).

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

51565560 is a wasteful number, since it uses less digits than its factorization.

51565560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 51565560 is about 7180.9163760623. The cubic root of 51565560 is about 372.2087509130.

It can be divided in two parts, 51565 and 560, that added together give a palindrome (52125).

The spelling of 51565560 in words is "fifty-one million, five hundred sixty-five thousand, five hundred sixty".