66198517126 has 16 divisors (see below), whose sum is σ = 113978737440. Its totient is φ = 28246901760.

The previous prime is 66198517109. The next prime is 66198517171. The reversal of 66198517126 is 62171589166.

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, 10320955 + ... + 10327366.

It is an arithmetic number, because the mean of its divisors is an integer number (7123671090).

Almost surely, 2^66198517126 is an apocalyptic number.

66198517126 is a deficient number, since it is larger than the sum of its proper divisors (47780220314).

66198517126 is a wasteful number, since it uses less digits than its factorization.

66198517126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20648559.

The product of its digits is 1088640, while the sum is 52.

The spelling of 66198517126 in words is "sixty-six billion, one hundred ninety-eight million, five hundred seventeen thousand, one hundred twenty-six".