640640305341 has 24 divisors (see below), whose sum is σ = 949166048376. Its totient is φ = 416137397760.

The previous prime is 640640305313. The next prime is 640640305363. The reversal of 640640305341 is 143503046046.

640640305341 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 4 + 0 + 305 + 341 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19623807225 + 621016498116 = 140085^2 + 788046^2 .

It is not a de Polignac number, because 640640305341 - 2¹⁹ = 640639781053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640640305296 and 640640305305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640640305391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 837760 + ... + 1408233.

It is an arithmetic number, because the mean of its divisors is an integer number (39548585349).

Almost surely, 2^640640305341 is an apocalyptic number.

It is an amenable number.

640640305341 is a deficient number, since it is larger than the sum of its proper divisors (308525743035).

640640305341 is a wasteful number, since it uses less digits than its factorization.

640640305341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246813 (or 2246810 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 640640305341 in words is "six hundred forty billion, six hundred forty million, three hundred five thousand, three hundred forty-one".