663774413506 has 4 divisors (see below), whose sum is σ = 995661620262. Its totient is φ = 331887206752.

The previous prime is 663774413479. The next prime is 663774413509. The reversal of 663774413506 is 605314477366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 661878246481 + 1896167025 = 813559^2 + 43545^2 .

It is not an unprimeable number, because it can be changed into a prime (663774413509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165943603375 + ... + 165943603378.

Almost surely, 2^663774413506 is an apocalyptic number.

663774413506 is a deficient number, since it is larger than the sum of its proper divisors (331887206756).

663774413506 is a wasteful number, since it uses less digits than its factorization.

663774413506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331887206755.

The product of its (nonzero) digits is 7620480, while the sum is 52.

The spelling of 663774413506 in words is "six hundred sixty-three billion, seven hundred seventy-four million, four hundred thirteen thousand, five hundred six".