668448761500 has 96 divisors (see below), whose sum is σ = 1572618954816. Its totient is φ = 246744748800.

The previous prime is 668448761483. The next prime is 668448761501. The reversal of 668448761500 is 5167844866.

668448761500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668448761501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28308699 + ... + 28332301.

It is an arithmetic number, because the mean of its divisors is an integer number (16381447446).

Almost surely, 2^668448761500 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 668448761500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786309477408).

668448761500 is an abundant number, since it is smaller than the sum of its proper divisors (904170193316).

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

668448761500 is a wasteful number, since it uses less digits than its factorization.

668448761500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27992 (or 27980 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 668448761500 in words is "six hundred sixty-eight billion, four hundred forty-eight million, seven hundred sixty-one thousand, five hundred".