331540921806 has 16 divisors (see below), whose sum is σ = 663091228800. Its totient is φ = 110512076408.

The previous prime is 331540921787. The next prime is 331540921841. The reversal of 331540921806 is 608129045133.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119455 + ... + 823013.

It is an arithmetic number, because the mean of its divisors is an integer number (41443201800).

Almost surely, 2^331540921806 is an apocalyptic number.

331540921806 is an abundant number, since it is smaller than the sum of its proper divisors (331550306994).

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

331540921806 is a wasteful number, since it uses less digits than its factorization.

331540921806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782103.

The product of its (nonzero) digits is 155520, while the sum is 42.

Adding to 331540921806 its reverse (608129045133), we get a palindrome (939669966939).

The spelling of 331540921806 in words is "three hundred thirty-one billion, five hundred forty million, nine hundred twenty-one thousand, eight hundred six".