640823485705005 has 32 divisors (see below), whose sum is σ = 1025488489148928. Its totient is φ = 341715558600000.

The previous prime is 640823485705003. The next prime is 640823485705027. The reversal of 640823485705005 is 500507584328046.

640823485705005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640823485705005 - 2¹ = 640823485705003 is a prime.

It is a super-2 number, since 2×640823485705005² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640823485705003) 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, 3451671430 + ... + 3451857080.

It is an arithmetic number, because the mean of its divisors is an integer number (32046515285904).

Almost surely, 2^{640823485705005} is an apocalyptic number.

It is an amenable number.

640823485705005 is a deficient number, since it is larger than the sum of its proper divisors (384665003443923).

640823485705005 is a wasteful number, since it uses less digits than its factorization.

640823485705005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222777.

The product of its (nonzero) digits is 32256000, while the sum is 57.

The spelling of 640823485705005 in words is "six hundred forty trillion, eight hundred twenty-three billion, four hundred eighty-five million, seven hundred five thousand, five".