664885640034 has 192 divisors, whose sum is σ = 1902498803712. Its totient is φ = 162471052800.

The previous prime is 664885640033. The next prime is 664885640053. The reversal of 664885640034 is 430046588466.

664885640034 is a `hidden beast` number, since 6 + 6 + 48 + 8 + 564 + 0 + 0 + 34 = 666.

It is not an unprimeable number, because it can be changed into a prime (664885640033) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 78857799 + ... + 78866229.

It is an arithmetic number, because the mean of its divisors is an integer number (9908847936).

Almost surely, 2^664885640034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664885640034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951249401856).

664885640034 is an abundant number, since it is smaller than the sum of its proper divisors (1237613163678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664885640034 is a wasteful number, since it uses less digits than its factorization.

664885640034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11821 (or 11818 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 54.

The spelling of 664885640034 in words is "six hundred sixty-four billion, eight hundred eighty-five million, six hundred forty thousand, thirty-four".