51656065 has 8 divisors (see below), whose sum is σ = 62404200. Its totient is φ = 41046912.

The previous prime is 51656063. The next prime is 51656083. The reversal of 51656065 is 56065615.

51656065 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 633616 + 51022449 = 796^2 + 7143^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51656065 - 2¹ = 51656063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51656065.

It is not an unprimeable number, because it can be changed into a prime (51656063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33924 + ... + 35413.

It is an arithmetic number, because the mean of its divisors is an integer number (7800525).

Almost surely, 2^51656065 is an apocalyptic number.

It is an amenable number.

51656065 is a deficient number, since it is larger than the sum of its proper divisors (10748135).

51656065 is a wasteful number, since it uses less digits than its factorization.

51656065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69491.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 51656065 is about 7187.2153856692. The cubic root of 51656065 is about 372.4263836626.

The spelling of 51656065 in words is "fifty-one million, six hundred fifty-six thousand, sixty-five".