51705565 has 8 divisors (see below), whose sum is σ = 63489888. Its totient is φ = 40402320.

The previous prime is 51705557. The next prime is 51705583. The reversal of 51705565 is 56550715.

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

It is not a de Polignac number, because 51705565 - 2³ = 51705557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51705565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120031 + ... + 120460.

It is an arithmetic number, because the mean of its divisors is an integer number (7936236).

Almost surely, 2^51705565 is an apocalyptic number.

It is an amenable number.

51705565 is a deficient number, since it is larger than the sum of its proper divisors (11784323).

51705565 is a wasteful number, since it uses less digits than its factorization.

51705565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240539.

The product of its (nonzero) digits is 26250, while the sum is 34.

The square root of 51705565 is about 7190.6581757166. The cubic root of 51705565 is about 372.5453062620.

The spelling of 51705565 in words is "fifty-one million, seven hundred five thousand, five hundred sixty-five".