331680016501656 has 64 divisors (see below), whose sum is σ = 829964000236800. Its totient is φ = 110458149475968.

The previous prime is 331680016501597. The next prime is 331680016501727. The reversal of 331680016501656 is 656105610086133.

It is a super-2 number, since 2×331680016501656² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331680016501599 and 331680016501608.

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, 1194506085 + ... + 1194783723.

It is an arithmetic number, because the mean of its divisors is an integer number (12968187503700).

Almost surely, 2^{331680016501656} is an apocalyptic number.

It is an amenable number.

331680016501656 is an abundant number, since it is smaller than the sum of its proper divisors (498283983735144).

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

331680016501656 is a wasteful number, since it uses less digits than its factorization.

331680016501656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323328 (or 323324 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 51.

Adding to 331680016501656 its reverse (656105610086133), we get a palindrome (987785626587789).

The spelling of 331680016501656 in words is "three hundred thirty-one trillion, six hundred eighty billion, sixteen million, five hundred one thousand, six hundred fifty-six".