640265531363 has 8 divisors (see below), whose sum is σ = 643630285056. Its totient is φ = 636907825800.

The previous prime is 640265531333. The next prime is 640265531371. The reversal of 640265531363 is 363135562046.

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 640265531363 - 2⁶ = 640265531299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640265531333) 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, 1579823 + ... + 1943288.

It is an arithmetic number, because the mean of its divisors is an integer number (80453785632).

Almost surely, 2^640265531363 is an apocalyptic number.

640265531363 is a deficient number, since it is larger than the sum of its proper divisors (3364753693).

640265531363 is a wasteful number, since it uses less digits than its factorization.

640265531363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524065.

The product of its (nonzero) digits is 1166400, while the sum is 44.

The spelling of 640265531363 in words is "six hundred forty billion, two hundred sixty-five million, five hundred thirty-one thousand, three hundred sixty-three".