51665455 has 16 divisors (see below), whose sum is σ = 63930240. Its totient is φ = 40061952.

The previous prime is 51665423. The next prime is 51665461. The reversal of 51665455 is 55456615.

51665455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51665455 - 2⁵ = 51665423 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24607 + ... + 26623.

It is an arithmetic number, because the mean of its divisors is an integer number (3995640).

Almost surely, 2^51665455 is an apocalyptic number.

51665455 is a deficient number, since it is larger than the sum of its proper divisors (12264785).

51665455 is a wasteful number, since it uses less digits than its factorization.

51665455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178.

The product of its digits is 90000, while the sum is 37.

The square root of 51665455 is about 7187.8685992441. The cubic root of 51665455 is about 372.4489487565.

The spelling of 51665455 in words is "fifty-one million, six hundred sixty-five thousand, four hundred fifty-five".