51140665 has 8 divisors (see below), whose sum is σ = 61504128. Its totient is φ = 40822320.

The previous prime is 51140611. The next prime is 51140689. The reversal of 51140665 is 56604115.

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

It is a de Polignac number, because none of the positive numbers 2^k-51140665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8731 + ... + 13360.

It is an arithmetic number, because the mean of its divisors is an integer number (7688016).

Almost surely, 2^51140665 is an apocalyptic number.

It is an amenable number.

51140665 is a deficient number, since it is larger than the sum of its proper divisors (10363463).

51140665 is a wasteful number, since it uses less digits than its factorization.

51140665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22559.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51140665 is about 7151.2701669004. The cubic root of 51140665 is about 371.1836092249.

The spelling of 51140665 in words is "fifty-one million, one hundred forty thousand, six hundred sixty-five".