11845871661 has 16 divisors (see below), whose sum is σ = 17012288384. Its totient is φ = 7288553664.

The previous prime is 11845871629. The next prime is 11845871671. The reversal of 11845871661 is 16617854811.

It is not a de Polignac number, because 11845871661 - 2⁵ = 11845871629 is a prime.

It is a super-3 number, since 3×11845871661³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11845871661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11845871671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249915 + ... + 293511.

It is an arithmetic number, because the mean of its divisors is an integer number (1063268024).

Almost surely, 2^11845871661 is an apocalyptic number.

It is an amenable number.

11845871661 is a deficient number, since it is larger than the sum of its proper divisors (5166416723).

11845871661 is a wasteful number, since it uses less digits than its factorization.

11845871661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50580.

The product of its digits is 322560, while the sum is 48.

The spelling of 11845871661 in words is "eleven billion, eight hundred forty-five million, eight hundred seventy-one thousand, six hundred sixty-one".