991398660029 has 8 divisors (see below), whose sum is σ = 1050111054720. Its totient is φ = 932730134976.

The previous prime is 991398660019. The next prime is 991398660037. The reversal of 991398660029 is 920066893199.

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

It is not a de Polignac number, because 991398660029 - 2⁸ = 991398659773 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 (991398660019) 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, 10920869 + ... + 11011274.

It is an arithmetic number, because the mean of its divisors is an integer number (131263881840).

Almost surely, 2^991398660029 is an apocalyptic number.

It is an amenable number.

991398660029 is a deficient number, since it is larger than the sum of its proper divisors (58712394691).

991398660029 is a wasteful number, since it uses less digits than its factorization.

991398660029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21934819.

The product of its (nonzero) digits is 11337408, while the sum is 62.

The spelling of 991398660029 in words is "nine hundred ninety-one billion, three hundred ninety-eight million, six hundred sixty thousand, twenty-nine".