640340541512 has 64 divisors (see below), whose sum is σ = 1419618096000. Its totient is φ = 264941623296.

The previous prime is 640340541479. The next prime is 640340541521. The reversal of 640340541512 is 215145043046.

It is a super-2 number, since 2×640340541512² (a number of 24 digits) contains 22 as substring.

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, 28615064 + ... + 28637432.

It is an arithmetic number, because the mean of its divisors is an integer number (22181532750).

Almost surely, 2^640340541512 is an apocalyptic number.

It is an amenable number.

640340541512 is an abundant number, since it is smaller than the sum of its proper divisors (779277554488).

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

640340541512 is a wasteful number, since it uses less digits than its factorization.

640340541512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40038 (or 40034 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 640340541512 its reverse (215145043046), we get a palindrome (855485584558).

The spelling of 640340541512 in words is "six hundred forty billion, three hundred forty million, five hundred forty-one thousand, five hundred twelve".