11312771818 has 8 divisors (see below), whose sum is σ = 16995146148. Its totient is φ = 5647723104.

The previous prime is 11312771731. The next prime is 11312771819. The reversal of 11312771818 is 81817721311.

It can be written as a sum of positive squares in 2 ways, for example, as 11285450289 + 27321529 = 106233^2 + 5227^2 .

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

It is a super-2 number, since 2×11312771818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11312771819) 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, 4329771 + ... + 4332382.

Almost surely, 2^11312771818 is an apocalyptic number.

11312771818 is a deficient number, since it is larger than the sum of its proper divisors (5682374330).

11312771818 is an equidigital number, since it uses as much as digits as its factorization.

11312771818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662808.

The product of its digits is 18816, while the sum is 40.

The spelling of 11312771818 in words is "eleven billion, three hundred twelve million, seven hundred seventy-one thousand, eight hundred eighteen".