640321421321472 has 72 divisors (see below), whose sum is σ = 1859115035793120. Its totient is φ = 194036794337280.

The previous prime is 640321421321429. The next prime is 640321421321473. The reversal of 640321421321472 is 274123124123046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640321421321473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37897802947 + ... + 37897819842.

Almost surely, 2^{640321421321472} is an apocalyptic number.

It is an amenable number.

640321421321472 is an abundant number, since it is smaller than the sum of its proper divisors (1218793614471648).

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

640321421321472 is a wasteful number, since it uses less digits than its factorization.

640321421321472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75795622819 (or 75795622805 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 640321421321472 in words is "six hundred forty trillion, three hundred twenty-one billion, four hundred twenty-one million, three hundred twenty-one thousand, four hundred seventy-two".