51665411 has 4 divisors (see below), whose sum is σ = 59046192. Its totient is φ = 44284632.

The previous prime is 51665399. The next prime is 51665413. The reversal of 51665411 is 11456615.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51665411 - 2²² = 47471107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51665413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3690380 + ... + 3690393.

It is an arithmetic number, because the mean of its divisors is an integer number (14761548).

Almost surely, 2^51665411 is an apocalyptic number.

51665411 is a deficient number, since it is larger than the sum of its proper divisors (7380781).

51665411 is an equidigital number, since it uses as much as digits as its factorization.

51665411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380780.

The product of its digits is 3600, while the sum is 29.

The square root of 51665411 is about 7187.8655385309. The cubic root of 51665411 is about 372.4488430265.

The spelling of 51665411 in words is "fifty-one million, six hundred sixty-five thousand, four hundred eleven".