664550287659 has 20 divisors (see below), whose sum is σ = 997174970176. Its totient is φ = 441046815696.

The previous prime is 664550287657. The next prime is 664550287691. The reversal of 664550287659 is 956782055466.

It is a happy number.

664550287659 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 502 + 8 + 76 + 59 = 666.

It is not a de Polignac number, because 664550287659 - 2¹ = 664550287657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664550287596 and 664550287605.

It is not an unprimeable number, because it can be changed into a prime (664550287657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18377284 + ... + 18413409.

Almost surely, 2^664550287659 is an apocalyptic number.

664550287659 is a deficient number, since it is larger than the sum of its proper divisors (332624682517).

664550287659 is a wasteful number, since it uses less digits than its factorization.

664550287659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36790928 (or 36790919 counting only the distinct ones).

The product of its (nonzero) digits is 108864000, while the sum is 63.

The spelling of 664550287659 in words is "six hundred sixty-four billion, five hundred fifty million, two hundred eighty-seven thousand, six hundred fifty-nine".