6662159921 has 8 divisors (see below), whose sum is σ = 7035577920. Its totient is φ = 6295721872.

The previous prime is 6662159909. The next prime is 6662159927. The reversal of 6662159921 is 1299512666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6662159921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6662159927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1743026 + ... + 1746843.

It is an arithmetic number, because the mean of its divisors is an integer number (879447240).

Almost surely, 2^6662159921 is an apocalyptic number.

It is an amenable number.

6662159921 is a deficient number, since it is larger than the sum of its proper divisors (373417999).

6662159921 is a wasteful number, since it uses less digits than its factorization.

6662159921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489975.

The product of its digits is 349920, while the sum is 47.

The square root of 6662159921 is about 81622.0553588306. The cubic root of 6662159921 is about 1881.6478611558.

The spelling of 6662159921 in words is "six billion, six hundred sixty-two million, one hundred fifty-nine thousand, nine hundred twenty-one".