5621666 has 4 divisors (see below), whose sum is σ = 8432502. Its totient is φ = 2810832.

The previous prime is 5621653. The next prime is 5621687. The reversal of 5621666 is 6661265.

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., 5621641 + 25 = 2371^2 + 5^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405415 + ... + 1405418.

Almost surely, 2^5621666 is an apocalyptic number.

5621666 is a deficient number, since it is larger than the sum of its proper divisors (2810836).

5621666 is a wasteful number, since it uses less digits than its factorization.

5621666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810835.

The product of its digits is 12960, while the sum is 32.

The square root of 5621666 is about 2371.0052720313. The cubic root of 5621666 is about 177.8095214438.

The spelling of 5621666 in words is "five million, six hundred twenty-one thousand, six hundred sixty-six".