66550063431 has 16 divisors (see below), whose sum is σ = 91145069024. Its totient is φ = 43161237504.

The previous prime is 66550063379. The next prime is 66550063453. The reversal of 66550063431 is 13436005566.

It is a happy number.

It is not a de Polignac number, because 66550063431 - 2¹⁷ = 66549932359 is a prime.

It is a super-2 number, since 2×66550063431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66550063431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550063031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780075 + ... + 861171.

It is an arithmetic number, because the mean of its divisors is an integer number (5696566814).

Almost surely, 2^66550063431 is an apocalyptic number.

66550063431 is a deficient number, since it is larger than the sum of its proper divisors (24595005593).

66550063431 is a wasteful number, since it uses less digits than its factorization.

66550063431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88530.

The product of its (nonzero) digits is 194400, while the sum is 39.

Adding to 66550063431 its reverse (13436005566), we get a palindrome (79986068997).

The spelling of 66550063431 in words is "sixty-six billion, five hundred fifty million, sixty-three thousand, four hundred thirty-one".