601656661 has 2 divisors, whose sum is σ = 601656662. Its totient is φ = 601656660.

The previous prime is 601656611. The next prime is 601656677. The reversal of 601656661 is 166656106.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 590198436 + 11458225 = 24294^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 601656661 - 2¹⁹ = 601132373 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 601656661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (601656611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300828330 + 300828331.

It is an arithmetic number, because the mean of its divisors is an integer number (300828331).

Almost surely, 2^601656661 is an apocalyptic number.

It is an amenable number.

601656661 is a deficient number, since it is larger than the sum of its proper divisors (1).

601656661 is an equidigital number, since it uses as much as digits as its factorization.

601656661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 601656661 is about 24528.6905683936. The cubic root of 601656661 is about 844.2082197235.

The spelling of 601656661 in words is "six hundred one million, six hundred fifty-six thousand, six hundred sixty-one".