6647666542 has 8 divisors (see below), whose sum is σ = 10877999832. Its totient is φ = 3021666600.

The previous prime is 6647666527. The next prime is 6647666593. The reversal of 6647666542 is 2456667466.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6647666542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151083309 + ... + 151083352.

It is an arithmetic number, because the mean of its divisors is an integer number (1359749979).

Almost surely, 2^6647666542 is an apocalyptic number.

6647666542 is a deficient number, since it is larger than the sum of its proper divisors (4230333290).

6647666542 is a wasteful number, since it uses less digits than its factorization.

6647666542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302166674.

The product of its digits is 8709120, while the sum is 52.

The square root of 6647666542 is about 81533.2235472142. The cubic root of 6647666542 is about 1880.2823762887.

The spelling of 6647666542 in words is "six billion, six hundred forty-seven million, six hundred sixty-six thousand, five hundred forty-two".