991068657 has 8 divisors (see below), whose sum is σ = 1333548480. Its totient is φ = 654650640.

The previous prime is 991068653. The next prime is 991068679. The reversal of 991068657 is 756860199.

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

It is not a de Polignac number, because 991068657 - 2² = 991068653 is a prime.

It is a super-3 number, since 3×991068657³ (a number of 28 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1515069 + ... + 1515722.

It is an arithmetic number, because the mean of its divisors is an integer number (166693560).

Almost surely, 2^991068657 is an apocalyptic number.

It is an amenable number.

991068657 is a deficient number, since it is larger than the sum of its proper divisors (342479823).

991068657 is a wasteful number, since it uses less digits than its factorization.

991068657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030903.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 991068657 is about 31481.2429392488. The cubic root of 991068657 is about 997.0139782153.

The spelling of 991068657 in words is "nine hundred ninety-one million, sixty-eight thousand, six hundred fifty-seven".