668240655468 has 24 divisors (see below), whose sum is σ = 1559242245120. Its totient is φ = 222744878160.

The previous prime is 668240655461. The next prime is 668240655479. The reversal of 668240655468 is 864556042866.

It is not an unprimeable number, because it can be changed into a prime (668240655461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820613 + ... + 2156643.

It is an arithmetic number, because the mean of its divisors is an integer number (64968426880).

Almost surely, 2^668240655468 is an apocalyptic number.

It is an amenable number.

668240655468 is an abundant number, since it is smaller than the sum of its proper divisors (891001589652).

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

668240655468 is a wasteful number, since it uses less digits than its factorization.

668240655468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501757 (or 501755 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 60.

The spelling of 668240655468 in words is "six hundred sixty-eight billion, two hundred forty million, six hundred fifty-five thousand, four hundred sixty-eight".