11406909681 has 12 divisors (see below), whose sum is σ = 16478670208. Its totient is φ = 7603672824.

The previous prime is 11406909671. The next prime is 11406909697. The reversal of 11406909681 is 18690960411.

It is not a de Polignac number, because 11406909681 - 2⁵ = 11406909649 is a prime.

It is a super-2 number, since 2×11406909681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11406909601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4116 + ... + 151098.

Almost surely, 2^11406909681 is an apocalyptic number.

It is an amenable number.

11406909681 is a deficient number, since it is larger than the sum of its proper divisors (5071760527).

11406909681 is a wasteful number, since it uses less digits than its factorization.

11406909681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155612 (or 155609 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 11406909681 in words is "eleven billion, four hundred six million, nine hundred nine thousand, six hundred eighty-one".