11612881172 has 72 divisors (see below), whose sum is σ = 21380435496. Its totient is φ = 5517517824.

The previous prime is 11612881153. The next prime is 11612881177. The reversal of 11612881172 is 27118821611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1471182736 + 10141698436 = 38356^2 + 100706^2 .

It is a super-2 number, since 2×11612881172² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11612881177) 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 23 ways as a sum of consecutive naturals, for example, 73967318 + ... + 73967474.

It is an arithmetic number, because the mean of its divisors is an integer number (296950493).

Almost surely, 2^11612881172 is an apocalyptic number.

It is an amenable number.

11612881172 is a deficient number, since it is larger than the sum of its proper divisors (9767554324).

11612881172 is a wasteful number, since it uses less digits than its factorization.

11612881172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 412 counting only the distinct ones).

The product of its digits is 10752, while the sum is 38.

The spelling of 11612881172 in words is "eleven billion, six hundred twelve million, eight hundred eighty-one thousand, one hundred seventy-two".