640538285396 has 6 divisors (see below), whose sum is σ = 1120941999450. Its totient is φ = 320269142696.

The previous prime is 640538285393. The next prime is 640538285423. The reversal of 640538285396 is 693582835046.

It can be written as a sum of positive squares in only one way, i.e., 448948241296 + 191590044100 = 670036^2 + 437710^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640538285393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80067285671 + ... + 80067285678.

It is an arithmetic number, because the mean of its divisors is an integer number (186823666575).

Almost surely, 2^640538285396 is an apocalyptic number.

It is an amenable number.

640538285396 is a deficient number, since it is larger than the sum of its proper divisors (480403714054).

640538285396 is a wasteful number, since it uses less digits than its factorization.

640538285396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160134571353 (or 160134571351 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 59.

The spelling of 640538285396 in words is "six hundred forty billion, five hundred thirty-eight million, two hundred eighty-five thousand, three hundred ninety-six".