51716665 has 32 divisors (see below), whose sum is σ = 83333376. Its totient is φ = 29756160.

The previous prime is 51716663. The next prime is 51716681. The reversal of 51716665 is 56661715.

It is not a de Polignac number, because 51716665 - 2¹ = 51716663 is a prime.

It is a super-2 number, since 2×51716665² = 5349226877444450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51716663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162 + ... + 10171.

It is an arithmetic number, because the mean of its divisors is an integer number (2604168).

Almost surely, 2^51716665 is an apocalyptic number.

51716665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51716665 is a deficient number, since it is larger than the sum of its proper divisors (31616711).

51716665 is a wasteful number, since it uses less digits than its factorization.

51716665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10369.

The product of its digits is 37800, while the sum is 37.

The square root of 51716665 is about 7191.4299690673. The cubic root of 51716665 is about 372.5719633348.

The spelling of 51716665 in words is "fifty-one million, seven hundred sixteen thousand, six hundred sixty-five".