641535166500 has 96 divisors (see below), whose sum is σ = 1872589660032. Its totient is φ = 170669520000.

The previous prime is 641535166499. The next prime is 641535166501. The reversal of 641535166500 is 5661535146.

It is an interprime number because it is at equal distance from previous prime (641535166499) and next prime (641535166501).

It is a hoax number, since the sum of its digits (42) 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 (641535166501) 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 31 ways as a sum of consecutive naturals, for example, 123555 + ... + 1139445.

It is an arithmetic number, because the mean of its divisors is an integer number (19506142292).

Almost surely, 2^641535166500 is an apocalyptic number.

641535166500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641535166500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936294830016).

641535166500 is an abundant number, since it is smaller than the sum of its proper divisors (1231054493532).

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

641535166500 is a wasteful number, since it uses less digits than its factorization.

641535166500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016334 (or 1016322 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 641535166500 in words is "six hundred forty-one billion, five hundred thirty-five million, one hundred sixty-six thousand, five hundred".