66831608221546 has 16 divisors (see below), whose sum is σ = 114569849911680. Its totient is φ = 28641773140560.

The previous prime is 66831608221513. The next prime is 66831608221571. The reversal of 66831608221546 is 64512280613866.

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, 27515686 + ... + 29845873.

It is an arithmetic number, because the mean of its divisors is an integer number (7160615619480).

Almost surely, 2^{66831608221546} is an apocalyptic number.

66831608221546 is a deficient number, since it is larger than the sum of its proper divisors (47738241690134).

66831608221546 is a wasteful number, since it uses less digits than its factorization.

66831608221546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57444789.

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 66831608221546 in words is "sixty-six trillion, eight hundred thirty-one billion, six hundred eight million, two hundred twenty-one thousand, five hundred forty-six".