99942626521 has 2 divisors, whose sum is σ = 99942626522. Its totient is φ = 99942626520.

The previous prime is 99942626519. The next prime is 99942626591. The reversal of 99942626521 is 12562624999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99859160025 + 83466496 = 316005^2 + 9136^2 .

It is a cyclic number.

It is not a de Polignac number, because 99942626521 - 2¹ = 99942626519 is a prime.

Together with 99942626519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99942626591) 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, 49971313260 + 49971313261.

It is an arithmetic number, because the mean of its divisors is an integer number (49971313261).

Almost surely, 2^99942626521 is an apocalyptic number.

It is an amenable number.

99942626521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99942626521 is an equidigital number, since it uses as much as digits as its factorization.

99942626521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 55.

The spelling of 99942626521 in words is "ninety-nine billion, nine hundred forty-two million, six hundred twenty-six thousand, five hundred twenty-one".