640823485705004 has 12 divisors (see below), whose sum is σ = 1281646971410064. Its totient is φ = 274638636730704.

The previous prime is 640823485705003. The next prime is 640823485705027. The reversal of 640823485705004 is 400507584328046.

640823485705004 is an admirable number.

It is a super-2 number, since 2×640823485705004² (a number of 30 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 11443276530419 + ... + 11443276530474.

It is an arithmetic number, because the mean of its divisors is an integer number (106803914284172).

Almost surely, 2^{640823485705004} is an apocalyptic number.

It is an amenable number.

640823485705004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640823485705004 is a wasteful number, since it uses less digits than its factorization.

640823485705004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22886553060904 (or 22886553060902 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 56.

The spelling of 640823485705004 in words is "six hundred forty trillion, eight hundred twenty-three billion, four hundred eighty-five million, seven hundred five thousand, four".