664171736355 has 48 divisors (see below), whose sum is σ = 1166377657536. Its totient is φ = 349587912960.

The previous prime is 664171736317. The next prime is 664171736359. The reversal of 664171736355 is 553637171466.

664171736355 is a `hidden beast` number, since 6 + 6 + 417 + 173 + 6 + 3 + 55 = 666.

664171736355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664171736355 - 2⁸ = 664171736099 is a prime.

It is a super-2 number, since 2×664171736355² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (664171736359) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1113525 + ... + 1602585.

It is an arithmetic number, because the mean of its divisors is an integer number (24299534532).

Almost surely, 2^664171736355 is an apocalyptic number.

664171736355 is a deficient number, since it is larger than the sum of its proper divisors (502205921181).

664171736355 is a wasteful number, since it uses less digits than its factorization.

664171736355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489468 (or 489465 counting only the distinct ones).

The product of its digits is 9525600, while the sum is 54.

The spelling of 664171736355 in words is "six hundred sixty-four billion, one hundred seventy-one million, seven hundred thirty-six thousand, three hundred fifty-five".