99876616381 has 2 divisors, whose sum is σ = 99876616382. Its totient is φ = 99876616380.

The previous prime is 99876616379. The next prime is 99876616403. The reversal of 99876616381 is 18361667899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90535393881 + 9341222500 = 300891^2 + 96650^2 .

It is a cyclic number.

It is not a de Polignac number, because 99876616381 - 2¹ = 99876616379 is a prime.

It is a super-2 number, since 2×99876616381² (a number of 23 digits) contains 22 as substring.

Together with 99876616379, 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 (99876616321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49938308190 + 49938308191.

It is an arithmetic number, because the mean of its divisors is an integer number (49938308191).

Almost surely, 2^99876616381 is an apocalyptic number.

It is an amenable number.

99876616381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99876616381 is an equidigital number, since it uses as much as digits as its factorization.

99876616381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 64.

The spelling of 99876616381 in words is "ninety-nine billion, eight hundred seventy-six million, six hundred sixteen thousand, three hundred eighty-one".