6661571662 has 4 divisors (see below), whose sum is σ = 9992357496. Its totient is φ = 3330785830.

The previous prime is 6661571633. The next prime is 6661571677. The reversal of 6661571662 is 2661751666.

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

It is a super-2 number, since 2×6661571662² = 88753074015922884488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665392914 + ... + 1665392917.

It is an arithmetic number, because the mean of its divisors is an integer number (2498089374).

Almost surely, 2^6661571662 is an apocalyptic number.

6661571662 is a deficient number, since it is larger than the sum of its proper divisors (3330785834).

6661571662 is a wasteful number, since it uses less digits than its factorization.

6661571662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330785833.

The product of its digits is 544320, while the sum is 46.

The square root of 6661571662 is about 81618.4517250848. The cubic root of 6661571662 is about 1881.5924772722.

The spelling of 6661571662 in words is "six billion, six hundred sixty-one million, five hundred seventy-one thousand, six hundred sixty-two".