6666015542 has 4 divisors (see below), whose sum is σ = 9999023316. Its totient is φ = 3333007770.

The previous prime is 6666015527. The next prime is 6666015557. The reversal of 6666015542 is 2455106666.

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

It is an interprime number because it is at equal distance from previous prime (6666015527) and next prime (6666015557).

It is a self number, because there is not a number n which added to its sum of digits gives 6666015542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1666503884 + ... + 1666503887.

It is an arithmetic number, because the mean of its divisors is an integer number (2499755829).

Almost surely, 2^6666015542 is an apocalyptic number.

6666015542 is a deficient number, since it is larger than the sum of its proper divisors (3333007774).

6666015542 is a wasteful number, since it uses less digits than its factorization.

6666015542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333007773.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 6666015542 is about 81645.6706874284. The cubic root of 6666015542 is about 1882.0107825901.

The spelling of 6666015542 in words is "six billion, six hundred sixty-six million, fifteen thousand, five hundred forty-two".