6661562 has 4 divisors (see below), whose sum is σ = 9992346. Its totient is φ = 3330780.

The previous prime is 6661553. The next prime is 6661583. The reversal of 6661562 is 2651666.

It is a Cunningham number, because it is equal to 2581²+1.

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., 6661561 + 1 = 2581^2 + 1^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665389 + ... + 1665392.

Almost surely, 2^6661562 is an apocalyptic number.

6661562 is a deficient number, since it is larger than the sum of its proper divisors (3330784).

6661562 is a wasteful number, since it uses less digits than its factorization.

6661562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330783.

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

The square root of 6661562 is about 2581.0001937234. Note that the first 3 decimals coincide. The cubic root of 6661562 is about 188.1591567579.

The spelling of 6661562 in words is "six million, six hundred sixty-one thousand, five hundred sixty-two".