99661567 has 2 divisors, whose sum is σ = 99661568. Its totient is φ = 99661566.

The previous prime is 99661547. The next prime is 99661589. The reversal of 99661567 is 76516699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99661567 - 2¹¹ = 99659519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99661567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99661547) 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 as a sum of consecutive naturals, namely, 49830783 + 49830784.

It is an arithmetic number, because the mean of its divisors is an integer number (49830784).

Almost surely, 2^99661567 is an apocalyptic number.

99661567 is a deficient number, since it is larger than the sum of its proper divisors (1).

99661567 is an equidigital number, since it uses as much as digits as its factorization.

99661567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 49.

The square root of 99661567 is about 9983.0640086098. The cubic root of 99661567 is about 463.6346692667.

The spelling of 99661567 in words is "ninety-nine million, six hundred sixty-one thousand, five hundred sixty-seven".