640254136302 has 288 divisors, whose sum is σ = 1630913356800. Its totient is φ = 179781638400.

The previous prime is 640254136283. The next prime is 640254136309. The reversal of 640254136302 is 203631452046.

640254136302 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 5 + 4 + 13 + 630 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640254136309) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 621002527 + ... + 621003557.

It is an arithmetic number, because the mean of its divisors is an integer number (5662893600).

Almost surely, 2^640254136302 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640254136302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815456678400).

640254136302 is an abundant number, since it is smaller than the sum of its proper divisors (990659220498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640254136302 is a wasteful number, since it uses less digits than its factorization.

640254136302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 640254136302 its reverse (203631452046), we get a palindrome (843885588348).

The spelling of 640254136302 in words is "six hundred forty billion, two hundred fifty-four million, one hundred thirty-six thousand, three hundred two".