54321665 has 16 divisors (see below), whose sum is σ = 68805120. Its totient is φ = 41057280.

The previous prime is 54321643. The next prime is 54321677. The reversal of 54321665 is 56612345.

It is not a de Polignac number, because 54321665 - 2¹⁸ = 54059521 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 54320 + ... + 55310.

It is an arithmetic number, because the mean of its divisors is an integer number (4300320).

Almost surely, 2^54321665 is an apocalyptic number.

It is an amenable number.

54321665 is a deficient number, since it is larger than the sum of its proper divisors (14483455).

54321665 is a wasteful number, since it uses less digits than its factorization.

54321665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its digits is 21600, while the sum is 32.

The square root of 54321665 is about 7370.3232629241. The cubic root of 54321665 is about 378.7253343266.

The spelling of 54321665 in words is "fifty-four million, three hundred twenty-one thousand, six hundred sixty-five".