6665320642 has 16 divisors (see below), whose sum is σ = 10068780960. Its totient is φ = 3309139008.

The previous prime is 6665320619. The next prime is 6665320643. The reversal of 6665320642 is 2460235666.

It is a junction number, because it is equal to n+sod(n) for n = 6665320595 and 6665320604.

It is not an unprimeable number, because it can be changed into a prime (6665320643) 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, 152698 + ... + 191434.

It is an arithmetic number, because the mean of its divisors is an integer number (629298810).

Almost surely, 2^6665320642 is an apocalyptic number.

6665320642 is a deficient number, since it is larger than the sum of its proper divisors (3403460318).

6665320642 is a wasteful number, since it uses less digits than its factorization.

6665320642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39345.

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 6665320642 is about 81641.4149926372. The cubic root of 6665320642 is about 1881.9453834656.

The spelling of 6665320642 in words is "six billion, six hundred sixty-five million, three hundred twenty thousand, six hundred forty-two".