640764366593 has 32 divisors (see below), whose sum is σ = 734106710400. Its totient is φ = 554405907456.

The previous prime is 640764366569. The next prime is 640764366629. The reversal of 640764366593 is 395663467046.

It is a cyclic number.

It is not a de Polignac number, because 640764366593 - 2¹⁰ = 640764365569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640764366793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10027721 + ... + 10091417.

It is an arithmetic number, because the mean of its divisors is an integer number (22940834700).

Almost surely, 2^640764366593 is an apocalyptic number.

It is an amenable number.

640764366593 is a deficient number, since it is larger than the sum of its proper divisors (93342343807).

640764366593 is a wasteful number, since it uses less digits than its factorization.

640764366593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64161.

The product of its (nonzero) digits is 58786560, while the sum is 59.

The spelling of 640764366593 in words is "six hundred forty billion, seven hundred sixty-four million, three hundred sixty-six thousand, five hundred ninety-three".