51065565 has 16 divisors (see below), whose sum is σ = 81932928. Its totient is φ = 27158976.

The previous prime is 51065533. The next prime is 51065579. The reversal of 51065565 is 56556015.

It is not a de Polignac number, because 51065565 - 2⁵ = 51065533 is a prime.

It is a Curzon number.

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, 1032 + ... + 10158.

It is an arithmetic number, because the mean of its divisors is an integer number (5120808).

Almost surely, 2^51065565 is an apocalyptic number.

It is an amenable number.

51065565 is a deficient number, since it is larger than the sum of its proper divisors (30867363).

51065565 is a wasteful number, since it uses less digits than its factorization.

51065565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508.

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

The square root of 51065565 is about 7146.0174223129. The cubic root of 51065565 is about 371.0018259973.

The spelling of 51065565 in words is "fifty-one million, sixty-five thousand, five hundred sixty-five".