321640711506 has 48 divisors (see below), whose sum is σ = 703528102368. Its totient is φ = 106192411200.

The previous prime is 321640711463. The next prime is 321640711529. The reversal of 321640711506 is 605117046123.

321640711506 is a `hidden beast` number, since 3 + 2 + 1 + 640 + 7 + 1 + 1 + 5 + 0 + 6 = 666.

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 23 ways as a sum of consecutive naturals, for example, 14088841 + ... + 14111651.

It is an arithmetic number, because the mean of its divisors is an integer number (14656835466).

Almost surely, 2^321640711506 is an apocalyptic number.

321640711506 is an abundant number, since it is smaller than the sum of its proper divisors (381887390862).

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

321640711506 is a wasteful number, since it uses less digits than its factorization.

321640711506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30247 (or 30244 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

Adding to 321640711506 its reverse (605117046123), we get a palindrome (926757757629).

The spelling of 321640711506 in words is "three hundred twenty-one billion, six hundred forty million, seven hundred eleven thousand, five hundred six".