991068655 has 4 divisors (see below), whose sum is σ = 1189282392. Its totient is φ = 792854920.

The previous prime is 991068653. The next prime is 991068679. The reversal of 991068655 is 556860199.

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

It is not a de Polignac number, because 991068655 - 2¹ = 991068653 is a prime.

It is a super-3 number, since 3×991068655³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 991068599 and 991068608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991068653) 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, 99106861 + ... + 99106870.

It is an arithmetic number, because the mean of its divisors is an integer number (297320598).

Almost surely, 2^991068655 is an apocalyptic number.

991068655 is a deficient number, since it is larger than the sum of its proper divisors (198213737).

991068655 is a wasteful number, since it uses less digits than its factorization.

991068655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198213736.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 991068655 is about 31481.2429074838. The cubic root of 991068655 is about 997.0139775447.

The spelling of 991068655 in words is "nine hundred ninety-one million, sixty-eight thousand, six hundred fifty-five".