663451878961 has 8 divisors (see below), whose sum is σ = 668694440960. Its totient is φ = 658209606768.

The previous prime is 663451878937. The next prime is 663451878967. The reversal of 663451878961 is 169878154366.

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 663451878961 - 2³³ = 654861944369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663451878893 and 663451878902.

It is not an unprimeable number, because it can be changed into a prime (663451878967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8647210 + ... + 8723596.

It is an arithmetic number, because the mean of its divisors is an integer number (83586805120).

Almost surely, 2^663451878961 is an apocalyptic number.

It is an amenable number.

663451878961 is a deficient number, since it is larger than the sum of its proper divisors (5242561999).

663451878961 is a wasteful number, since it uses less digits than its factorization.

663451878961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144903.

The product of its digits is 52254720, while the sum is 64.

The spelling of 663451878961 in words is "six hundred sixty-three billion, four hundred fifty-one million, eight hundred seventy-eight thousand, nine hundred sixty-one".