548813666 has 4 divisors (see below), whose sum is σ = 823220502. Its totient is φ = 274406832.

The previous prime is 548813653. The next prime is 548813717. The reversal of 548813666 is 666318845.

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., 327429025 + 221384641 = 18095^2 + 14879^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 548813666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137203415 + ... + 137203418.

Almost surely, 2^548813666 is an apocalyptic number.

548813666 is a deficient number, since it is larger than the sum of its proper divisors (274406836).

548813666 is a wasteful number, since it uses less digits than its factorization.

548813666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274406835.

The product of its digits is 829440, while the sum is 47.

The square root of 548813666 is about 23426.7724196057. The cubic root of 548813666 is about 818.7317624980.

The spelling of 548813666 in words is "five hundred forty-eight million, eight hundred thirteen thousand, six hundred sixty-six".