640254232450 has 24 divisors (see below), whose sum is σ = 1360997569152. Its totient is φ = 219515736720.

The previous prime is 640254232433. The next prime is 640254232547. The reversal of 640254232450 is 54232452046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 914648554 + ... + 914649253.

It is an arithmetic number, because the mean of its divisors is an integer number (56708232048).

Almost surely, 2^640254232450 is an apocalyptic number.

640254232450 is an abundant number, since it is smaller than the sum of its proper divisors (720743336702).

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

640254232450 is a wasteful number, since it uses less digits than its factorization.

640254232450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829297826 (or 1829297821 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 640254232450 its reverse (54232452046), we get a palindrome (694486684496).

The spelling of 640254232450 in words is "six hundred forty billion, two hundred fifty-four million, two hundred thirty-two thousand, four hundred fifty".