9156977786881 has 4 divisors (see below), whose sum is σ = 9166350334212. Its totient is φ = 9147605239552.

The previous prime is 9156977786867. The next prime is 9156977786897. The reversal of 9156977786881 is 1886877796519.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8869579937856 + 287397849025 = 2978184^2 + 536095^2 .

It is a cyclic number.

It is not a de Polignac number, because 9156977786881 - 2⁷ = 9156977786753 is a prime.

It is a super-2 number, since 2×9156977786881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9156977786795 and 9156977786804.

It is not an unprimeable number, because it can be changed into a prime (9156977786821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4686272200 + ... + 4686274153.

It is an arithmetic number, because the mean of its divisors is an integer number (2291587583553).

Almost surely, 2^{9156977786881} is an apocalyptic number.

It is an amenable number.

9156977786881 is a deficient number, since it is larger than the sum of its proper divisors (9372547331).

9156977786881 is an equidigital number, since it uses as much as digits as its factorization.

9156977786881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9372547330.

The product of its digits is 2560481280, while the sum is 82.

The spelling of 9156977786881 in words is "nine trillion, one hundred fifty-six billion, nine hundred seventy-seven million, seven hundred eighty-six thousand, eight hundred eighty-one".