51056665 has 16 divisors (see below), whose sum is σ = 69745536. Its totient is φ = 35516800.

The previous prime is 51056657. The next prime is 51056669. The reversal of 51056665 is 56665015.

It is not a de Polignac number, because 51056665 - 2³ = 51056657 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 51056665.

It is not an unprimeable number, because it can be changed into a prime (51056669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18916 + ... + 21445.

It is an arithmetic number, because the mean of its divisors is an integer number (4359096).

Almost surely, 2^51056665 is an apocalyptic number.

51056665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51056665 is a deficient number, since it is larger than the sum of its proper divisors (18688871).

51056665 is a wasteful number, since it uses less digits than its factorization.

51056665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40400.

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

The square root of 51056665 is about 7145.3946706952. The cubic root of 51056665 is about 370.9802713019.

It can be divided in two parts, 510 and 56665, that added together give a palindrome (57175).

The spelling of 51056665 in words is "fifty-one million, fifty-six thousand, six hundred sixty-five".