99856865899 has 8 divisors (see below), whose sum is σ = 120128560640. Its totient is φ = 81086778216.

The previous prime is 99856865863. The next prime is 99856865909.

It is a happy number.

99856865899 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99856865899 - 2³³ = 91266931307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99856865839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375401619 + ... + 375401884.

It is an arithmetic number, because the mean of its divisors is an integer number (15016070080).

Almost surely, 2^99856865899 is an apocalyptic number.

99856865899 is a deficient number, since it is larger than the sum of its proper divisors (20271694741).

99856865899 is a wasteful number, since it uses less digits than its factorization.

99856865899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750803529.

The product of its digits is 3023308800, while the sum is 82.

The spelling of 99856865899 in words is "ninety-nine billion, eight hundred fifty-six million, eight hundred sixty-five thousand, eight hundred ninety-nine".