6686747542 has 8 divisors (see below), whose sum is σ = 10466213616. Its totient is φ = 3198009672.

The previous prime is 6686747527. The next prime is 6686747549. The reversal of 6686747542 is 2457476866.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686747549) by changing a digit.

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, 72681993 + ... + 72682084.

It is an arithmetic number, because the mean of its divisors is an integer number (1308276702).

Almost surely, 2^6686747542 is an apocalyptic number.

6686747542 is a deficient number, since it is larger than the sum of its proper divisors (3779466074).

6686747542 is a wasteful number, since it uses less digits than its factorization.

6686747542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145364102.

The product of its digits is 13547520, while the sum is 55.

The square root of 6686747542 is about 81772.5353771057. The cubic root of 6686747542 is about 1883.9598463245.

The spelling of 6686747542 in words is "six billion, six hundred eighty-six million, seven hundred forty-seven thousand, five hundred forty-two".