668618461 has 16 divisors (see below), whose sum is σ = 801331200. Its totient is φ = 545747328.

The previous prime is 668618459. The next prime is 668618471. The reversal of 668618461 is 164816866.

It is not a de Polignac number, because 668618461 - 2¹ = 668618459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668618471) 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 15 ways as a sum of consecutive naturals, for example, 7741 + ... + 37378.

It is an arithmetic number, because the mean of its divisors is an integer number (50083200).

Almost surely, 2^668618461 is an apocalyptic number.

It is an amenable number.

668618461 is a deficient number, since it is larger than the sum of its proper divisors (132712739).

668618461 is a wasteful number, since it uses less digits than its factorization.

668618461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45228.

The product of its digits is 331776, while the sum is 46.

The square root of 668618461 is about 25857.6576858771. The cubic root of 668618461 is about 874.4321588108.

The spelling of 668618461 in words is "six hundred sixty-eight million, six hundred eighteen thousand, four hundred sixty-one".