54215666 has 4 divisors (see below), whose sum is σ = 81323502. Its totient is φ = 27107832.

The previous prime is 54215659. The next prime is 54215687. The reversal of 54215666 is 66651245.

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

It can be written as a sum of positive squares in only one way, i.e., 43943641 + 10272025 = 6629^2 + 3205^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13553915 + ... + 13553918.

Almost surely, 2^54215666 is an apocalyptic number.

54215666 is a deficient number, since it is larger than the sum of its proper divisors (27107836).

54215666 is a wasteful number, since it uses less digits than its factorization.

54215666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27107835.

The product of its digits is 43200, while the sum is 35.

The square root of 54215666 is about 7363.1288186477. The cubic root of 54215666 is about 378.4788357049.

The spelling of 54215666 in words is "fifty-four million, two hundred fifteen thousand, six hundred sixty-six".