9906778275841 has 4 divisors (see below), whose sum is σ = 10428187658800. Its totient is φ = 9385368892884.

The previous prime is 9906778275827. The next prime is 9906778275887. The reversal of 9906778275841 is 1485728776099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9906778275841 - 2²⁹ = 9906241404929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9906778275341) 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, 260704691451 + ... + 260704691488.

It is an arithmetic number, because the mean of its divisors is an integer number (2607046914700).

It is a Proth number, since it is equal to 295245 ⋅ 2²⁵ + 1 and 295245 < 2²⁵.

Almost surely, 2^{9906778275841} is an apocalyptic number.

It is an amenable number.

9906778275841 is a deficient number, since it is larger than the sum of its proper divisors (521409382959).

9906778275841 is a wasteful number, since it uses less digits than its factorization.

9906778275841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521409382958.

The product of its (nonzero) digits is 426746880, while the sum is 73.

The spelling of 9906778275841 in words is "nine trillion, nine hundred six billion, seven hundred seventy-eight million, two hundred seventy-five thousand, eight hundred forty-one".