668132333640 has 96 divisors (see below), whose sum is σ = 2171583156600. Its totient is φ = 178156062720.

The previous prime is 668132333629. The next prime is 668132333651. The reversal of 668132333640 is 46333231866.

It is an interprime number because it is at equal distance from previous prime (668132333629) and next prime (668132333651).

It can be written as a sum of positive squares in 4 ways, for example, as 601763238756 + 66369094884 = 775734^2 + 257622^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5770720 + ... + 5885360.

Almost surely, 2^668132333640 is an apocalyptic number.

668132333640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668132333640 is an abundant number, since it is smaller than the sum of its proper divisors (1503450822960).

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

668132333640 is a wasteful number, since it uses less digits than its factorization.

668132333640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130847 (or 130840 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The spelling of 668132333640 in words is "six hundred sixty-eight billion, one hundred thirty-two million, three hundred thirty-three thousand, six hundred forty".