667511221475542 has 16 divisors (see below), whose sum is σ = 1002533872317120. Its totient is φ = 333333340728768.

The previous prime is 667511221475477. The next prime is 667511221475563. The reversal of 667511221475542 is 245574122115766.

667511221475542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1755033 + ... + 36580084.

It is an arithmetic number, because the mean of its divisors is an integer number (62658367019820).

Almost surely, 2^{667511221475542} is an apocalyptic number.

667511221475542 is a deficient number, since it is larger than the sum of its proper divisors (335022650841578).

667511221475542 is a wasteful number, since it uses less digits than its factorization.

667511221475542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38346135.

The product of its digits is 28224000, while the sum is 58.

The spelling of 667511221475542 in words is "six hundred sixty-seven trillion, five hundred eleven billion, two hundred twenty-one million, four hundred seventy-five thousand, five hundred forty-two".