10991838993407 has 4 divisors (see below), whose sum is σ = 10992098896200. Its totient is φ = 10991579090616.

The previous prime is 10991838993341. The next prime is 10991838993413. The reversal of 10991838993407 is 70439983819901.

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 10991838993407 - 2¹⁰ = 10991838992383 is a prime.

It is a super-2 number, since 2×10991838993407² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991838993427) 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, 129887948 + ... + 129972545.

It is an arithmetic number, because the mean of its divisors is an integer number (2748024724050).

Almost surely, 2^{10991838993407} is an apocalyptic number.

10991838993407 is a deficient number, since it is larger than the sum of its proper divisors (259902793).

10991838993407 is an equidigital number, since it uses as much as digits as its factorization.

10991838993407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259902792.

The product of its (nonzero) digits is 105815808, while the sum is 71.

The spelling of 10991838993407 in words is "ten trillion, nine hundred ninety-one billion, eight hundred thirty-eight million, nine hundred ninety-three thousand, four hundred seven".