66198424574438 has 32 divisors (see below), whose sum is σ = 107780287620096. Its totient is φ = 30311880697728.

The previous prime is 66198424574437. The next prime is 66198424574497. The reversal of 66198424574438 is 83447542489166.

66198424574438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66198424574438² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66198424574437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171157520 + ... + 171543852.

It is an arithmetic number, because the mean of its divisors is an integer number (3368133988128).

Almost surely, 2^{66198424574438} is an apocalyptic number.

66198424574438 is a deficient number, since it is larger than the sum of its proper divisors (41581863045658).

66198424574438 is a wasteful number, since it uses less digits than its factorization.

66198424574438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438368.

The product of its digits is 1114767360, while the sum is 71.

The spelling of 66198424574438 in words is "sixty-six trillion, one hundred ninety-eight billion, four hundred twenty-four million, five hundred seventy-four thousand, four hundred thirty-eight".