99511011599 has 4 divisors (see below), whose sum is σ = 101142339720. Its totient is φ = 97879683480.

The previous prime is 99511011557. The next prime is 99511011617.

99511011599 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99511011599 - 2⁸ = 99511011343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99511011199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815663969 + ... + 815664090.

It is an arithmetic number, because the mean of its divisors is an integer number (25285584930).

Almost surely, 2^99511011599 is an apocalyptic number.

99511011599 is a deficient number, since it is larger than the sum of its proper divisors (1631328121).

99511011599 is a wasteful number, since it uses less digits than its factorization.

99511011599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631328120.

The product of its (nonzero) digits is 164025, while the sum is 50.

The spelling of 99511011599 in words is "ninety-nine billion, five hundred eleven million, eleven thousand, five hundred ninety-nine".