640506120522 has 8 divisors (see below), whose sum is σ = 1281012241056. Its totient is φ = 213502040172.

The previous prime is 640506120511. The next prime is 640506120559. The reversal of 640506120522 is 225021605046.

It is a sphenic number, since it is the product of 3 distinct primes.

640506120522 is an admirable number.

It is a super-2 number, since 2×640506120522² (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 3 ways as a sum of consecutive naturals, for example, 53375510038 + ... + 53375510049.

It is an arithmetic number, because the mean of its divisors is an integer number (160126530132).

Almost surely, 2^640506120522 is an apocalyptic number.

640506120522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640506120522 is a wasteful number, since it uses less digits than its factorization.

640506120522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106751020092.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 640506120522 its reverse (225021605046), we get a palindrome (865527725568).

The spelling of 640506120522 in words is "six hundred forty billion, five hundred six million, one hundred twenty thousand, five hundred twenty-two".