99523421551 has 2 divisors, whose sum is σ = 99523421552. Its totient is φ = 99523421550.

The previous prime is 99523421549. The next prime is 99523421617. The reversal of 99523421551 is 15512432599.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99523421551 - 2¹ = 99523421549 is a prime.

It is a super-2 number, since 2×99523421551² (a number of 23 digits) contains 22 as substring.

Together with 99523421549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99523421531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49761710775 + 49761710776.

It is an arithmetic number, because the mean of its divisors is an integer number (49761710776).

Almost surely, 2^99523421551 is an apocalyptic number.

99523421551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99523421551 is an equidigital number, since it uses as much as digits as its factorization.

99523421551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 46.

The spelling of 99523421551 in words is "ninety-nine billion, five hundred twenty-three million, four hundred twenty-one thousand, five hundred fifty-one".