11156177681 has 8 divisors (see below), whose sum is σ = 12324432000. Its totient is φ = 10013599440.

The previous prime is 11156177671. The next prime is 11156177719. The reversal of 11156177681 is 18677165111.

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

It is a cyclic number.

It is not a de Polignac number, because 11156177681 - 2¹⁴ = 11156161297 is a prime.

It is a super-4 number, since 4×11156177681⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11156177611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6418106 + ... + 6419843.

It is an arithmetic number, because the mean of its divisors is an integer number (1540554000).

Almost surely, 2^11156177681 is an apocalyptic number.

11156177681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11156177681 is a deficient number, since it is larger than the sum of its proper divisors (1168254319).

11156177681 is a wasteful number, since it uses less digits than its factorization.

11156177681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12838039.

The product of its digits is 70560, while the sum is 44.

The spelling of 11156177681 in words is "eleven billion, one hundred fifty-six million, one hundred seventy-seven thousand, six hundred eighty-one".