668461839 has 8 divisors (see below), whose sum is σ = 892697472. Its totient is φ = 444933720.

The previous prime is 668461813. The next prime is 668461847. The reversal of 668461839 is 938164866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668461839 - 2⁸ = 668461583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668461791 and 668461800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668461889) 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, 174669 + ... + 178454.

It is an arithmetic number, because the mean of its divisors is an integer number (111587184).

Almost surely, 2^668461839 is an apocalyptic number.

668461839 is a deficient number, since it is larger than the sum of its proper divisors (224235633).

668461839 is a wasteful number, since it uses less digits than its factorization.

668461839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353757.

The product of its digits is 1492992, while the sum is 51.

The square root of 668461839 is about 25854.6289665893. The cubic root of 668461839 is about 874.3638757183.

The spelling of 668461839 in words is "six hundred sixty-eight million, four hundred sixty-one thousand, eight hundred thirty-nine".