668127512262 has 64 divisors (see below), whose sum is σ = 1567138180608. Its totient is φ = 185911200000.

The previous prime is 668127512243. The next prime is 668127512263. The reversal of 668127512262 is 262215721866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668127512263) 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, 643512 + ... + 1323012.

It is an arithmetic number, because the mean of its divisors is an integer number (24486534072).

Almost surely, 2^668127512262 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668127512262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783569090304).

668127512262 is an abundant number, since it is smaller than the sum of its proper divisors (899010668346).

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

668127512262 is a wasteful number, since it uses less digits than its factorization.

668127512262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680125.

The product of its digits is 967680, while the sum is 48.

The spelling of 668127512262 in words is "six hundred sixty-eight billion, one hundred twenty-seven million, five hundred twelve thousand, two hundred sixty-two".