11705178638 has 16 divisors (see below), whose sum is σ = 17934606144. Its totient is φ = 5727022080.

The previous prime is 11705178587. The next prime is 11705178707. The reversal of 11705178638 is 83687150711.

11705178638 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11705178638² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a junction number, because it is equal to n+sod(n) for n = 11705178592 and 11705178601.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 865706 + ... + 879122.

It is an arithmetic number, because the mean of its divisors is an integer number (1120912884).

Almost surely, 2^11705178638 is an apocalyptic number.

11705178638 is a deficient number, since it is larger than the sum of its proper divisors (6229427506).

11705178638 is a wasteful number, since it uses less digits than its factorization.

11705178638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22747.

The product of its (nonzero) digits is 282240, while the sum is 47.

The spelling of 11705178638 in words is "eleven billion, seven hundred five million, one hundred seventy-eight thousand, six hundred thirty-eight".