640450466502 has 96 divisors (see below), whose sum is σ = 1612703506176. Its totient is φ = 165974677440.

The previous prime is 640450466489. The next prime is 640450466543. The reversal of 640450466502 is 205664054046.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 2109088 + ... + 2393564.

It is an arithmetic number, because the mean of its divisors is an integer number (16798994856).

Almost surely, 2^640450466502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640450466502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806351753088).

640450466502 is an abundant number, since it is smaller than the sum of its proper divisors (972253039674).

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

640450466502 is a wasteful number, since it uses less digits than its factorization.

640450466502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284954 (or 284943 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 640450466502 in words is "six hundred forty billion, four hundred fifty million, four hundred sixty-six thousand, five hundred two".