663841515445 has 8 divisors (see below), whose sum is σ = 796782235320. Its totient is φ = 530958267840.

The previous prime is 663841515443. The next prime is 663841515457. The reversal of 663841515445 is 544515148366.

It can be written as a sum of positive squares in 4 ways, for example, as 138712298481 + 525129216964 = 372441^2 + 724658^2 .

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

It is not a de Polignac number, because 663841515445 - 2¹ = 663841515443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663841515392 and 663841515401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663841515443) 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, 14342650 + ... + 14388859.

It is an arithmetic number, because the mean of its divisors is an integer number (99597779415).

Almost surely, 2^663841515445 is an apocalyptic number.

It is an amenable number.

663841515445 is a deficient number, since it is larger than the sum of its proper divisors (132940719875).

663841515445 is a wasteful number, since it uses less digits than its factorization.

663841515445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28736135.

The product of its digits is 6912000, while the sum is 52.

The spelling of 663841515445 in words is "six hundred sixty-three billion, eight hundred forty-one million, five hundred fifteen thousand, four hundred forty-five".