640253461005 has 24 divisors (see below), whose sum is σ = 1109796879672. Its totient is φ = 341461062144.

The previous prime is 640253460991. The next prime is 640253461007. The reversal of 640253461005 is 500164352046.

640253461005 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 5 + 34 + 610 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 153634209444 + 486619251561 = 391962^2 + 697581^2 .

It is not a de Polignac number, because 640253461005 - 2¹⁵ = 640253428237 is a prime.

It is a super-2 number, since 2×640253461005² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640253461007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2388097 + ... + 2642633.

It is an arithmetic number, because the mean of its divisors is an integer number (46241536653).

Almost surely, 2^640253461005 is an apocalyptic number.

It is an amenable number.

640253461005 is a deficient number, since it is larger than the sum of its proper divisors (469543418667).

640253461005 is a wasteful number, since it uses less digits than its factorization.

640253461005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310445 (or 310442 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 640253461005 in words is "six hundred forty billion, two hundred fifty-three million, four hundred sixty-one thousand, five".