663133173505421 has 8 divisors (see below), whose sum is σ = 704810744915904. Its totient is φ = 621752239614400.

The previous prime is 663133173505399. The next prime is 663133173505463. The reversal of 663133173505421 is 124505371331366.

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 663133173505421 - 2⁶ = 663133173505357 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 663133173505421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663133172505421) 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, 74159375255 + ... + 74159384196.

It is an arithmetic number, because the mean of its divisors is an integer number (88101343114488).

Almost surely, 2^{663133173505421} is an apocalyptic number.

It is an amenable number.

663133173505421 is a deficient number, since it is larger than the sum of its proper divisors (41677571410483).

663133173505421 is a wasteful number, since it uses less digits than its factorization.

663133173505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148318759731.

The product of its (nonzero) digits is 4082400, while the sum is 50.

The spelling of 663133173505421 in words is "six hundred sixty-three trillion, one hundred thirty-three billion, one hundred seventy-three million, five hundred five thousand, four hundred twenty-one".