1161806578261 has 8 divisors (see below), whose sum is σ = 1327794097280. Its totient is φ = 995822846928.

The previous prime is 1161806578249. The next prime is 1161806578271. The reversal of 1161806578261 is 1628756081611.

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

It is not a de Polignac number, because 1161806578261 - 2¹¹ = 1161806576213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1161806578199 and 1161806578208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161806578271) 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, 256026 + ... + 1545691.

It is an arithmetic number, because the mean of its divisors is an integer number (165974262160).

Almost surely, 2^{1161806578261} is an apocalyptic number.

It is an amenable number.

1161806578261 is a deficient number, since it is larger than the sum of its proper divisors (165987519019).

1161806578261 is an equidigital number, since it uses as much as digits as its factorization.

1161806578261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893843.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 1161806578261 in words is "one trillion, one hundred sixty-one billion, eight hundred six million, five hundred seventy-eight thousand, two hundred sixty-one".