640145016500 has 48 divisors (see below), whose sum is σ = 1525174612416. Its totient is φ = 232780004000.

The previous prime is 640145016491. The next prime is 640145016551. The reversal of 640145016500 is 5610541046.

640145016500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58189502 + ... + 58200501.

It is an arithmetic number, because the mean of its divisors is an integer number (31774471092).

Almost surely, 2^640145016500 is an apocalyptic number.

It is an amenable number.

640145016500 is an abundant number, since it is smaller than the sum of its proper divisors (885029595916).

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

640145016500 is a wasteful number, since it uses less digits than its factorization.

640145016500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116390033 (or 116390021 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 640145016500 its reverse (5610541046), we get a palindrome (645755557546).

The spelling of 640145016500 in words is "six hundred forty billion, one hundred forty-five million, sixteen thousand, five hundred".