661868301 has 8 divisors (see below), whose sum is σ = 883334944. Its totient is φ = 440823600.

The previous prime is 661868269. The next prime is 661868351. The reversal of 661868301 is 103868166.

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

It is not a de Polignac number, because 661868301 - 2⁵ = 661868269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661868301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661868351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101806 + ... + 108111.

It is an arithmetic number, because the mean of its divisors is an integer number (110416868).

Almost surely, 2^661868301 is an apocalyptic number.

It is an amenable number.

661868301 is a deficient number, since it is larger than the sum of its proper divisors (221466643).

661868301 is a wasteful number, since it uses less digits than its factorization.

661868301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210971.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 661868301 is about 25726.8012197397. The cubic root of 661868301 is about 871.4795368805.

The spelling of 661868301 in words is "six hundred sixty-one million, eight hundred sixty-eight thousand, three hundred one".