663321748461 has 16 divisors (see below), whose sum is σ = 886441780224. Its totient is φ = 441208363824.

The previous prime is 663321748457. The next prime is 663321748513. The reversal of 663321748461 is 164847123366.

It is not a de Polignac number, because 663321748461 - 2² = 663321748457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663321748861) 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, 12053370 + ... + 12108276.

It is an arithmetic number, because the mean of its divisors is an integer number (55402611264).

Almost surely, 2^663321748461 is an apocalyptic number.

It is an amenable number.

663321748461 is a deficient number, since it is larger than the sum of its proper divisors (223120031763).

663321748461 is a wasteful number, since it uses less digits than its factorization.

663321748461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64000.

The product of its digits is 3483648, while the sum is 51.

The spelling of 663321748461 in words is "six hundred sixty-three billion, three hundred twenty-one million, seven hundred forty-eight thousand, four hundred sixty-one".