64943774320 has 40 divisors (see below), whose sum is σ = 151776665136. Its totient is φ = 25842905088.

The previous prime is 64943774267. The next prime is 64943774333. The reversal of 64943774320 is 2347734946.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2087662 + ... + 2118541.

Almost surely, 2^64943774320 is an apocalyptic number.

It is an amenable number.

64943774320 is an abundant number, since it is smaller than the sum of its proper divisors (86832890816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64943774320 is a wasteful number, since it uses less digits than its factorization.

64943774320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4206409 (or 4206403 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 49.

The spelling of 64943774320 in words is "sixty-four billion, nine hundred forty-three million, seven hundred seventy-four thousand, three hundred twenty".