640152050485 has 4 divisors (see below), whose sum is σ = 768182460588. Its totient is φ = 512121640384.

The previous prime is 640152050443. The next prime is 640152050491. The reversal of 640152050485 is 584050251046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 584050251046 = 2 ⋅292025125523.

It can be written as a sum of positive squares in 2 ways, for example, as 201175572676 + 438976477809 = 448526^2 + 662553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640152050485 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64015205044 + ... + 64015205053.

It is an arithmetic number, because the mean of its divisors is an integer number (192045615147).

Almost surely, 2^640152050485 is an apocalyptic number.

It is an amenable number.

640152050485 is a deficient number, since it is larger than the sum of its proper divisors (128030410103).

640152050485 is a wasteful number, since it uses less digits than its factorization.

640152050485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128030410102.

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 640152050485 in words is "six hundred forty billion, one hundred fifty-two million, fifty thousand, four hundred eighty-five".