664820717355 has 24 divisors (see below), whose sum is σ = 1153198998432. Its totient is φ = 354311637504.

The previous prime is 664820717347. The next prime is 664820717359. The reversal of 664820717355 is 553717028466.

664820717355 is a `hidden beast` number, since 66 + 482 + 0 + 71 + 7 + 35 + 5 = 666.

It is not a de Polignac number, because 664820717355 - 2³ = 664820717347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664820717359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5342214 + ... + 5465243.

It is an arithmetic number, because the mean of its divisors is an integer number (48049958268).

Almost surely, 2^664820717355 is an apocalyptic number.

664820717355 is a deficient number, since it is larger than the sum of its proper divisors (488378281077).

664820717355 is a wasteful number, since it uses less digits than its factorization.

664820717355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10808835 (or 10808832 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 664820717355 in words is "six hundred sixty-four billion, eight hundred twenty million, seven hundred seventeen thousand, three hundred fifty-five".