66438013369 has 32 divisors (see below), whose sum is σ = 83077406720. Its totient is φ = 51730166592.

The previous prime is 66438013339. The next prime is 66438013379. The reversal of 66438013369 is 96331083466.

66438013369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66438013369 - 2⁵ = 66438013337 is a prime.

It is a super-2 number, since 2×66438013369² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66438013339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2191972 + ... + 2222074.

It is an arithmetic number, because the mean of its divisors is an integer number (2596168960).

Almost surely, 2^66438013369 is an apocalyptic number.

It is an amenable number.

66438013369 is a deficient number, since it is larger than the sum of its proper divisors (16639393351).

66438013369 is a wasteful number, since it uses less digits than its factorization.

66438013369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30509.

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 66438013369 in words is "sixty-six billion, four hundred thirty-eight million, thirteen thousand, three hundred sixty-nine".