99666653 has 2 divisors, whose sum is σ = 99666654. Its totient is φ = 99666652.

The previous prime is 99666607. The next prime is 99666661. The reversal of 99666653 is 35666699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92891044 + 6775609 = 9638^2 + 2603^2 .

It is a cyclic number.

It is not a de Polignac number, because 99666653 - 2⁸ = 99666397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99660653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49833326 + 49833327.

It is an arithmetic number, because the mean of its divisors is an integer number (49833327).

Almost surely, 2^99666653 is an apocalyptic number.

It is an amenable number.

99666653 is a deficient number, since it is larger than the sum of its proper divisors (1).

99666653 is an equidigital number, since it uses as much as digits as its factorization.

99666653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 50.

The square root of 99666653 is about 9983.3187367729. The cubic root of 99666653 is about 463.6425559773.

The spelling of 99666653 in words is "ninety-nine million, six hundred sixty-six thousand, six hundred fifty-three".