641558512 has 80 divisors (see below), whose sum is σ = 1511903232. Its totient is φ = 257448960.

The previous prime is 641558497. The next prime is 641558513. The reversal of 641558512 is 215855146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641558513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423837 + ... + 425347.

Almost surely, 2^641558512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641558512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755951616).

641558512 is an abundant number, since it is smaller than the sum of its proper divisors (870344720).

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

641558512 is a wasteful number, since it uses less digits than its factorization.

641558512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766 (or 1760 counting only the distinct ones).

The product of its digits is 48000, while the sum is 37.

The square root of 641558512 is about 25329.0053495987. The cubic root of 641558512 is about 862.4728323586.

It can be divided in two parts, 641 and 558512, that added together give a triangular number (559153 = T₁₀₅₇).

The spelling of 641558512 in words is "six hundred forty-one million, five hundred fifty-eight thousand, five hundred twelve".