66434246538 has 16 divisors (see below), whose sum is σ = 144947447136. Its totient is φ = 20131589840.

The previous prime is 66434246537. The next prime is 66434246551. The reversal of 66434246538 is 83564243466.

It is a super-2 number, since 2×66434246538² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66434246531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503289681 + ... + 503289812.

It is an arithmetic number, because the mean of its divisors is an integer number (9059215446).

Almost surely, 2^66434246538 is an apocalyptic number.

66434246538 is an abundant number, since it is smaller than the sum of its proper divisors (78513200598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66434246538 is a wasteful number, since it uses less digits than its factorization.

66434246538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006579509.

The product of its digits is 9953280, while the sum is 51.

The spelling of 66434246538 in words is "sixty-six billion, four hundred thirty-four million, two hundred forty-six thousand, five hundred thirty-eight".