640432030853 has 8 divisors (see below), whose sum is σ = 645160761336. Its totient is φ = 635716382400.

The previous prime is 640432030813. The next prime is 640432030883. The reversal of 640432030853 is 358030234046.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16027053604 + 624404977249 = 126598^2 + 790193^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640432030853 - 2⁸ = 640432030597 is a prime.

It is a super-2 number, since 2×640432030853² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640432030813) 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 in 7 ways as a sum of consecutive naturals, for example, 3172226 + ... + 3368067.

It is an arithmetic number, because the mean of its divisors is an integer number (80645095167).

Almost surely, 2^640432030853 is an apocalyptic number.

It is an amenable number.

640432030853 is a deficient number, since it is larger than the sum of its proper divisors (4728730483).

640432030853 is a wasteful number, since it uses less digits than its factorization.

640432030853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6541015.

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 640432030853 its reverse (358030234046), we get a palindrome (998462264899).

The spelling of 640432030853 in words is "six hundred forty billion, four hundred thirty-two million, thirty thousand, eight hundred fifty-three".