668701840242 has 32 divisors (see below), whose sum is σ = 1395726059520. Its totient is φ = 213182639120.

The previous prime is 668701840237. The next prime is 668701840249. The reversal of 668701840242 is 242048107866.

It is a super-2 number, since 2×668701840242² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 668701840191 and 668701840200.

It is not an unprimeable number, because it can be changed into a prime (668701840249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 820609 + ... + 1418027.

It is an arithmetic number, because the mean of its divisors is an integer number (43616439360).

Almost surely, 2^668701840242 is an apocalyptic number.

668701840242 is an abundant number, since it is smaller than the sum of its proper divisors (727024219278).

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

668701840242 is a wasteful number, since it uses less digits than its factorization.

668701840242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605558.

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 668701840242 in words is "six hundred sixty-eight billion, seven hundred one million, eight hundred forty thousand, two hundred forty-two".