11845332981 has 24 divisors (see below), whose sum is σ = 18319967640. Its totient is φ = 7348847616.

The previous prime is 11845332979. The next prime is 11845332991. The reversal of 11845332981 is 18923354811.

11845332981 is a `hidden beast` number, since 1 + 18 + 4 + 533 + 29 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2452356 + 11842880625 = 1566^2 + 108825^2 .

It is not a de Polignac number, because 11845332981 - 2¹ = 11845332979 is a prime.

It is a super-2 number, since 2×11845332981² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11845332931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 421330 + ... + 448563.

It is an arithmetic number, because the mean of its divisors is an integer number (763331985).

Almost surely, 2^11845332981 is an apocalyptic number.

It is an amenable number.

11845332981 is a deficient number, since it is larger than the sum of its proper divisors (6474634659).

11845332981 is a wasteful number, since it uses less digits than its factorization.

11845332981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870005 (or 870002 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 11845332981 in words is "eleven billion, eight hundred forty-five million, three hundred thirty-two thousand, nine hundred eighty-one".