51695665 has 16 divisors (see below), whose sum is σ = 71632512. Its totient is φ = 35080704.

The previous prime is 51695663. The next prime is 51695681. The reversal of 51695665 is 56659615.

It is a cyclic number.

It is not a de Polignac number, because 51695665 - 2¹ = 51695663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51695663) 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, 4219 + ... + 11008.

It is an arithmetic number, because the mean of its divisors is an integer number (4477032).

Almost surely, 2^51695665 is an apocalyptic number.

It is an amenable number.

51695665 is a deficient number, since it is larger than the sum of its proper divisors (19936847).

51695665 is a wasteful number, since it uses less digits than its factorization.

51695665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15336.

The product of its digits is 243000, while the sum is 43.

The square root of 51695665 is about 7189.9697495887. The cubic root of 51695665 is about 372.5215278161.

The spelling of 51695665 in words is "fifty-one million, six hundred ninety-five thousand, six hundred sixty-five".