640446451026 has 16 divisors (see below), whose sum is σ = 1292644214400. Its totient is φ = 211523598288.

The previous prime is 640446450929. The next prime is 640446451037. The reversal of 640446451026 is 620154644046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489637306 + ... + 489638613.

It is an arithmetic number, because the mean of its divisors is an integer number (80790263400).

Almost surely, 2^640446451026 is an apocalyptic number.

640446451026 is an abundant number, since it is smaller than the sum of its proper divisors (652197763374).

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

640446451026 is a wasteful number, since it uses less digits than its factorization.

640446451026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979276033.

The product of its (nonzero) digits is 552960, while the sum is 42.

The spelling of 640446451026 in words is "six hundred forty billion, four hundred forty-six million, four hundred fifty-one thousand, twenty-six".