99965857 has 2 divisors, whose sum is σ = 99965858. Its totient is φ = 99965856.

The previous prime is 99965849. The next prime is 99965869. The reversal of 99965857 is 75856999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97535376 + 2430481 = 9876^2 + 1559^2 .

It is an emirp because it is prime and its reverse (75856999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99965857 - 2³ = 99965849 is a prime.

It is a super-3 number, since 3×99965857³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (99965357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49982928 + 49982929.

It is an arithmetic number, because the mean of its divisors is an integer number (49982929).

Almost surely, 2^99965857 is an apocalyptic number.

It is an amenable number.

99965857 is a deficient number, since it is larger than the sum of its proper divisors (1).

99965857 is an equidigital number, since it uses as much as digits as its factorization.

99965857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6123600, while the sum is 58.

The square root of 99965857 is about 9998.2927042571. The cubic root of 99965857 is about 464.1060514255.

The spelling of 99965857 in words is "ninety-nine million, nine hundred sixty-five thousand, eight hundred fifty-seven".