64673357939 has 8 divisors (see below), whose sum is σ = 66910071360. Its totient is φ = 62437084416.

The previous prime is 64673357849. The next prime is 64673357981. The reversal of 64673357939 is 93975337646.

64673357939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64673357939 - 2¹⁶ = 64673292403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64673357989) 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, 204422 + ... + 413684.

It is an arithmetic number, because the mean of its divisors is an integer number (8363758920).

Almost surely, 2^64673357939 is an apocalyptic number.

64673357939 is a deficient number, since it is larger than the sum of its proper divisors (2236713421).

64673357939 is a wasteful number, since it uses less digits than its factorization.

64673357939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219949.

The product of its digits is 77157360, while the sum is 62.

The spelling of 64673357939 in words is "sixty-four billion, six hundred seventy-three million, three hundred fifty-seven thousand, nine hundred thirty-nine".