51665395 has 8 divisors (see below), whose sum is σ = 62063280. Its totient is φ = 41289120.

The previous prime is 51665387. The next prime is 51665399. The reversal of 51665395 is 59356615.

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

It is not a de Polignac number, because 51665395 - 2³ = 51665387 is a prime.

It is a super-3 number, since 3×51665395³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51665399) 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, 436 + ... + 10174.

It is an arithmetic number, because the mean of its divisors is an integer number (7757910).

Almost surely, 2^51665395 is an apocalyptic number.

51665395 is a deficient number, since it is larger than the sum of its proper divisors (10397885).

51665395 is a wasteful number, since it uses less digits than its factorization.

51665395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805.

The product of its digits is 121500, while the sum is 40.

The square root of 51665395 is about 7187.8644255439. The cubic root of 51665395 is about 372.4488045793.

The spelling of 51665395 in words is "fifty-one million, six hundred sixty-five thousand, three hundred ninety-five".