663042464056221 has 16 divisors (see below), whose sum is σ = 890858216590848. Its totient is φ = 438627912522800.

The previous prime is 663042464056187. The next prime is 663042464056249. The reversal of 663042464056221 is 122650464240366.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 663042464056221 - 2¹⁰ = 663042464055197 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663042464056261) 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, 43653825 + ... + 56848406.

It is an arithmetic number, because the mean of its divisors is an integer number (55678638536928).

Almost surely, 2^{663042464056221} is an apocalyptic number.

It is an amenable number.

663042464056221 is a deficient number, since it is larger than the sum of its proper divisors (227815752534627).

663042464056221 is a wasteful number, since it uses less digits than its factorization.

663042464056221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100519152.

The product of its (nonzero) digits is 9953280, while the sum is 51.

The spelling of 663042464056221 in words is "six hundred sixty-three trillion, forty-two billion, four hundred sixty-four million, fifty-six thousand, two hundred twenty-one".