320015387681 has 16 divisors (see below), whose sum is σ = 353069787840. Its totient is φ = 287639838720.

The previous prime is 320015387621. The next prime is 320015387683. The reversal of 320015387681 is 186783510023.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 320015387681 - 2²² = 320011193377 is a prime.

It is a super-3 number, since 3×320015387681³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (320015387683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116336 + ... + 808433.

It is an arithmetic number, because the mean of its divisors is an integer number (22066861740).

Almost surely, 2^320015387681 is an apocalyptic number.

It is an amenable number.

320015387681 is a deficient number, since it is larger than the sum of its proper divisors (33054400159).

320015387681 is a wasteful number, since it uses less digits than its factorization.

320015387681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925136.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 320015387681 in words is "three hundred twenty billion, fifteen million, three hundred eighty-seven thousand, six hundred eighty-one".