64993550393 has 4 divisors (see below), whose sum is σ = 65049920628. Its totient is φ = 64937180160.

The previous prime is 64993550333. The next prime is 64993550417. The reversal of 64993550393 is 39305539946.

64993550393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51020419129 + 13973131264 = 225877^2 + 118208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64993550393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64993550333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28183388 + ... + 28185693.

It is an arithmetic number, because the mean of its divisors is an integer number (16262480157).

Almost surely, 2^64993550393 is an apocalyptic number.

It is an amenable number.

64993550393 is a deficient number, since it is larger than the sum of its proper divisors (56370235).

64993550393 is a wasteful number, since it uses less digits than its factorization.

64993550393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56370234.

The product of its (nonzero) digits is 11809800, while the sum is 56.

The spelling of 64993550393 in words is "sixty-four billion, nine hundred ninety-three million, five hundred fifty thousand, three hundred ninety-three".