640006361332 has 48 divisors (see below), whose sum is σ = 1237412392272. Its totient is φ = 287756651520.

The previous prime is 640006361329. The next prime is 640006361369. The reversal of 640006361332 is 233163600046.

It can be written as a sum of positive squares in 8 ways, for example, as 19702052496 + 620304308836 = 140364^2 + 787594^2 .

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, 1221658 + ... + 1665070.

It is an arithmetic number, because the mean of its divisors is an integer number (25779424839).

Almost surely, 2^640006361332 is an apocalyptic number.

It is an amenable number.

640006361332 is a deficient number, since it is larger than the sum of its proper divisors (597406030940).

640006361332 is a wasteful number, since it uses less digits than its factorization.

640006361332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444148 (or 444146 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 34.

Adding to 640006361332 its reverse (233163600046), we get a palindrome (873169961378).

The spelling of 640006361332 in words is "six hundred forty billion, six million, three hundred sixty-one thousand, three hundred thirty-two".