658321661 has 2 divisors, whose sum is σ = 658321662. Its totient is φ = 658321660.

The previous prime is 658321627. The next prime is 658321681. The reversal of 658321661 is 166123856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341695225 + 316626436 = 18485^2 + 17794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-658321661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (658321681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329160830 + 329160831.

It is an arithmetic number, because the mean of its divisors is an integer number (329160831).

Almost surely, 2^658321661 is an apocalyptic number.

It is an amenable number.

658321661 is a deficient number, since it is larger than the sum of its proper divisors (1).

658321661 is an equidigital number, since it uses as much as digits as its factorization.

658321661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 658321661 is about 25657.7797363685. The cubic root of 658321661 is about 869.9201322727.

The spelling of 658321661 in words is "six hundred fifty-eight million, three hundred twenty-one thousand, six hundred sixty-one".