11156642406405 has 40 divisors (see below), whose sum is σ = 20122009836192. Its totient is φ = 5913704896992.

The previous prime is 11156642406383. The next prime is 11156642406409. The reversal of 11156642406405 is 50460424665111.

11156642406405 is a `hidden beast` number, since 1 + 1 + 1 + 566 + 4 + 2 + 40 + 6 + 40 + 5 = 666.

It is not a de Polignac number, because 11156642406405 - 2⁵ = 11156642406373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156642406409) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 84434799 + ... + 84566828.

Almost surely, 2^{11156642406405} is an apocalyptic number.

11156642406405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11156642406405 is a deficient number, since it is larger than the sum of its proper divisors (8965367429787).

11156642406405 is a wasteful number, since it uses less digits than its factorization.

11156642406405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169001807 (or 169001798 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 11156642406405 in words is "eleven trillion, one hundred fifty-six billion, six hundred forty-two million, four hundred six thousand, four hundred five".