64123939395 has 192 divisors, whose sum is σ = 125219727360. Its totient is φ = 30190178304.

The previous prime is 64123939393. The next prime is 64123939403. The reversal of 64123939395 is 59393932146.

It is not a de Polignac number, because 64123939395 - 2¹ = 64123939393 is a prime.

It is a super-2 number, since 2×64123939395² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64123939393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 383975602 + ... + 383975768.

It is an arithmetic number, because the mean of its divisors is an integer number (652186080).

Almost surely, 2^64123939395 is an apocalyptic number.

64123939395 is a deficient number, since it is larger than the sum of its proper divisors (61095787965).

64123939395 is a wasteful number, since it uses less digits than its factorization.

64123939395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 511 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The spelling of 64123939395 in words is "sixty-four billion, one hundred twenty-three million, nine hundred thirty-nine thousand, three hundred ninety-five".