66438896313 has 16 divisors (see below), whose sum is σ = 89848452096. Its totient is φ = 43661185680.

The previous prime is 66438896281. The next prime is 66438896389. The reversal of 66438896313 is 31369883466.

66438896313 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 66438896313 - 2⁵ = 66438896281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66438896393) 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, 1374156 + ... + 1421682.

It is an arithmetic number, because the mean of its divisors is an integer number (5615528256).

Almost surely, 2^66438896313 is an apocalyptic number.

It is an amenable number.

66438896313 is a deficient number, since it is larger than the sum of its proper divisors (23409555783).

66438896313 is a wasteful number, since it uses less digits than its factorization.

66438896313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54164.

The product of its digits is 13436928, while the sum is 57.

The spelling of 66438896313 in words is "sixty-six billion, four hundred thirty-eight million, eight hundred ninety-six thousand, three hundred thirteen".