331688649505 has 16 divisors (see below), whose sum is σ = 411242056704. Its totient is φ = 256556139840.

The previous prime is 331688649431. The next prime is 331688649569. The reversal of 331688649505 is 505946886133.

It is not a de Polignac number, because 331688649505 - 2¹⁹ = 331688125217 is a prime.

It is a super-2 number, since 2×331688649505² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331688649505.

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, 809509 + ... + 1148338.

It is an arithmetic number, because the mean of its divisors is an integer number (25702628544).

Almost surely, 2^331688649505 is an apocalyptic number.

It is an amenable number.

331688649505 is a deficient number, since it is larger than the sum of its proper divisors (79553407199).

331688649505 is a wasteful number, since it uses less digits than its factorization.

331688649505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958976.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 331688649505 in words is "three hundred thirty-one billion, six hundred eighty-eight million, six hundred forty-nine thousand, five hundred five".