11811340585 has 32 divisors (see below), whose sum is σ = 15681548160. Its totient is φ = 8539579840.

The previous prime is 11811340579. The next prime is 11811340589. The reversal of 11811340585 is 58504311811.

It is not a de Polignac number, because 11811340585 - 2⁵ = 11811340553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11811340589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1146186 + ... + 1156444.

It is an arithmetic number, because the mean of its divisors is an integer number (490048380).

Almost surely, 2^11811340585 is an apocalyptic number.

It is an amenable number.

11811340585 is a deficient number, since it is larger than the sum of its proper divisors (3870207575).

11811340585 is a wasteful number, since it uses less digits than its factorization.

11811340585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470 (or 10448 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 37.

It can be divided in two parts, 118 and 11340585, that added together give a triangular number (11340703 = T₄₇₆₂).

The spelling of 11811340585 in words is "eleven billion, eight hundred eleven million, three hundred forty thousand, five hundred eighty-five".