640405200253 has 16 divisors (see below), whose sum is σ = 788211204480. Its totient is φ = 506681246016.

The previous prime is 640405200229. The next prime is 640405200301. The reversal of 640405200253 is 352002504046.

It is a cyclic number.

It is not a de Polignac number, because 640405200253 - 2⁵ = 640405200221 is a prime.

It is a super-2 number, since 2×640405200253² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640405200223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5141751 + ... + 5264827.

It is an arithmetic number, because the mean of its divisors is an integer number (49263200280).

Almost surely, 2^640405200253 is an apocalyptic number.

It is an amenable number.

640405200253 is a deficient number, since it is larger than the sum of its proper divisors (147806004227).

640405200253 is a wasteful number, since it uses less digits than its factorization.

640405200253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180276.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 640405200253 its reverse (352002504046), we get a palindrome (992407704299).

The spelling of 640405200253 in words is "six hundred forty billion, four hundred five million, two hundred thousand, two hundred fifty-three".