663919831345 has 8 divisors (see below), whose sum is σ = 798999776064. Its totient is φ = 529605212784.

The previous prime is 663919831319. The next prime is 663919831349. The reversal of 663919831345 is 543138919366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663919831345 - 2⁷ = 663919831217 is a prime.

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 663919831345.

It is not an unprimeable number, because it can be changed into a prime (663919831349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191329629 + ... + 191333098.

It is an arithmetic number, because the mean of its divisors is an integer number (99874972008).

Almost surely, 2^663919831345 is an apocalyptic number.

It is an amenable number.

663919831345 is a deficient number, since it is larger than the sum of its proper divisors (135079944719).

663919831345 is a wasteful number, since it uses less digits than its factorization.

663919831345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382663079.

The product of its digits is 12597120, while the sum is 58.

The spelling of 663919831345 in words is "six hundred sixty-three billion, nine hundred nineteen million, eight hundred thirty-one thousand, three hundred forty-five".