64123939394 has 16 divisors (see below), whose sum is σ = 99299174400. Its totient is φ = 31024433280.

The previous prime is 64123939393. The next prime is 64123939403. The reversal of 64123939394 is 49393932146.

64123939394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64123939394² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64123939393) 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, 599282 + ... + 698130.

It is an arithmetic number, because the mean of its divisors is an integer number (6206198400).

Almost surely, 2^64123939394 is an apocalyptic number.

64123939394 is a deficient number, since it is larger than the sum of its proper divisors (35175235006).

64123939394 is a wasteful number, since it uses less digits than its factorization.

64123939394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109345.

The product of its digits is 3779136, while the sum is 53.

The spelling of 64123939394 in words is "sixty-four billion, one hundred twenty-three million, nine hundred thirty-nine thousand, three hundred ninety-four".