640052267545 has 16 divisors (see below), whose sum is σ = 821626838928. Its totient is φ = 476953436160.

The previous prime is 640052267527. The next prime is 640052267581. The reversal of 640052267545 is 545762250046.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5969725696 + 634082541849 = 77264^2 + 796293^2 .

It is not a de Polignac number, because 640052267545 - 2²¹ = 640050170393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640052267495 and 640052267504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38806326 + ... + 38822815.

It is an arithmetic number, because the mean of its divisors is an integer number (51351677433).

Almost surely, 2^640052267545 is an apocalyptic number.

It is an amenable number.

640052267545 is a deficient number, since it is larger than the sum of its proper divisors (181574571383).

640052267545 is a wasteful number, since it uses less digits than its factorization.

640052267545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77629260.

The product of its (nonzero) digits is 2016000, while the sum is 46.

The spelling of 640052267545 in words is "six hundred forty billion, fifty-two million, two hundred sixty-seven thousand, five hundred forty-five".