99638573989 has 2 divisors, whose sum is σ = 99638573990. Its totient is φ = 99638573988.

The previous prime is 99638573963. The next prime is 99638574017. The reversal of 99638573989 is 98937583699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99042384100 + 596189889 = 314710^2 + 24417^2 .

It is an emirp because it is prime and its reverse (98937583699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99638573989 - 2¹³ = 99638565797 is a prime.

It is a super-2 number, since 2×99638573989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99638573959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49819286994 + 49819286995.

It is an arithmetic number, because the mean of its divisors is an integer number (49819286995).

Almost surely, 2^99638573989 is an apocalyptic number.

It is an amenable number.

99638573989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99638573989 is an equidigital number, since it uses as much as digits as its factorization.

99638573989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793618560, while the sum is 76.

The spelling of 99638573989 in words is "ninety-nine billion, six hundred thirty-eight million, five hundred seventy-three thousand, nine hundred eighty-nine".