54666646 has 4 divisors (see below), whose sum is σ = 81999972. Its totient is φ = 27333322.

The previous prime is 54666641. The next prime is 54666659. The reversal of 54666646 is 64666645.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64666645 = 5 ⋅12933329.

It is a super-3 number, since 3×54666646³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54666641) by changing a digit.

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 as a sum of consecutive naturals, namely, 13666660 + ... + 13666663.

It is an arithmetic number, because the mean of its divisors is an integer number (20499993).

Almost surely, 2^54666646 is an apocalyptic number.

54666646 is a deficient number, since it is larger than the sum of its proper divisors (27333326).

54666646 is a wasteful number, since it uses less digits than its factorization.

54666646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27333325.

The product of its digits is 622080, while the sum is 43.

The square root of 54666646 is about 7393.6896066849. The cubic root of 54666646 is about 379.5253677112.

Subtracting 54666646 from its reverse (64666645), we obtain a palindrome (9999999).

The spelling of 54666646 in words is "fifty-four million, six hundred sixty-six thousand, six hundred forty-six".