99841618657 has 4 divisors (see below), whose sum is σ = 108918129456. Its totient is φ = 90765107860.

The previous prime is 99841618567. The next prime is 99841618757. The reversal of 99841618657 is 75681614899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75681614899 = 11 ⋅6880146809.

It is a cyclic number.

It is not a de Polignac number, because 99841618657 - 2¹⁹ = 99841094369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99841618157) 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 in 3 ways as a sum of consecutive naturals, for example, 4538255383 + ... + 4538255404.

It is an arithmetic number, because the mean of its divisors is an integer number (27229532364).

Almost surely, 2^99841618657 is an apocalyptic number.

It is an amenable number.

99841618657 is a deficient number, since it is larger than the sum of its proper divisors (9076510799).

99841618657 is a wasteful number, since it uses less digits than its factorization.

99841618657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9076510798.

The product of its digits is 26127360, while the sum is 64.

The spelling of 99841618657 in words is "ninety-nine billion, eight hundred forty-one million, six hundred eighteen thousand, six hundred fifty-seven".