9958797811 has 4 divisors (see below), whose sum is σ = 9959026000. Its totient is φ = 9958569624.

The previous prime is 9958797799. The next prime is 9958797817. The reversal of 9958797811 is 1187978599.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1187978599 = 61 ⋅19475059.

It is a cyclic number.

It is not a de Polignac number, because 9958797811 - 2²⁷ = 9824580083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9958797817) 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, 25911 + ... + 143488.

It is an arithmetic number, because the mean of its divisors is an integer number (2489756500).

Almost surely, 2^9958797811 is an apocalyptic number.

9958797811 is a deficient number, since it is larger than the sum of its proper divisors (228189).

9958797811 is a wasteful number, since it uses less digits than its factorization.

9958797811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228188.

The product of its digits is 11430720, while the sum is 64.

The square root of 9958797811 is about 99793.7764141632. The cubic root of 9958797811 is about 2151.4717027366.

The spelling of 9958797811 in words is "nine billion, nine hundred fifty-eight million, seven hundred ninety-seven thousand, eight hundred eleven".