99991335445 has 4 divisors (see below), whose sum is σ = 119989602540. Its totient is φ = 79993068352.

The previous prime is 99991335401. The next prime is 99991335467. The reversal of 99991335445 is 54453319999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63370006756 + 36621328689 = 251734^2 + 191367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99991335445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9999133540 + ... + 9999133549.

It is an arithmetic number, because the mean of its divisors is an integer number (29997400635).

Almost surely, 2^99991335445 is an apocalyptic number.

It is an amenable number.

99991335445 is a deficient number, since it is larger than the sum of its proper divisors (19998267095).

99991335445 is a wasteful number, since it uses less digits than its factorization.

99991335445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19998267094.

The product of its digits is 23619600, while the sum is 61.

The spelling of 99991335445 in words is "ninety-nine billion, nine hundred ninety-one million, three hundred thirty-five thousand, four hundred forty-five".