646521105255150 has 192 divisors, whose sum is σ = 1612067467953600. Its totient is φ = 171472933355520.

The previous prime is 646521105255041. The next prime is 646521105255257. The reversal of 646521105255150 is 51552501125646.

It is a self number, because there is not a number n which added to its sum of digits gives 646521105255150.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 85870776586 + ... + 85870784114.

It is an arithmetic number, because the mean of its divisors is an integer number (8396184728925).

Almost surely, 2^{646521105255150} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646521105255150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806033733976800).

646521105255150 is an abundant number, since it is smaller than the sum of its proper divisors (965546362698450).

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

646521105255150 is a wasteful number, since it uses less digits than its factorization.

646521105255150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10903 (or 10898 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 48.

The spelling of 646521105255150 in words is "six hundred forty-six trillion, five hundred twenty-one billion, one hundred five million, two hundred fifty-five thousand, one hundred fifty".