99123447557 has 2 divisors, whose sum is σ = 99123447558. Its totient is φ = 99123447556.

The previous prime is 99123447551. The next prime is 99123447559. The reversal of 99123447557 is 75574432199.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98978822881 + 144624676 = 314609^2 + 12026^2 .

It is a cyclic number.

It is not a de Polignac number, because 99123447557 - 2⁴ = 99123447541 is a prime.

Together with 99123447559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99123447551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49561723778 + 49561723779.

It is an arithmetic number, because the mean of its divisors is an integer number (49561723779).

Almost surely, 2^99123447557 is an apocalyptic number.

It is an amenable number.

99123447557 is a deficient number, since it is larger than the sum of its proper divisors (1).

99123447557 is an equidigital number, since it uses as much as digits as its factorization.

99123447557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9525600, while the sum is 56.

The spelling of 99123447557 in words is "ninety-nine billion, one hundred twenty-three million, four hundred forty-seven thousand, five hundred fifty-seven".