11811777124 has 45 divisors (see below), whose sum is σ = 24136040537. Its totient is φ = 5057625552.

The previous prime is 11811777073. The next prime is 11811777143. The reversal of 11811777124 is 42177711811.

It is a happy number.

The square root of 11811777124 is 108682.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 190937124 + 11620840000 = 13818^2 + 107800^2 .

It is a super-2 number, since 2×11811777124² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 10650282 + ... + 10651390.

Almost surely, 2^11811777124 is an apocalyptic number.

11811777124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

11811777124 is the 108682-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11811777124

11811777124 is an abundant number, since it is smaller than the sum of its proper divisors (12324263413).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11811777124 is an frugal number, since it uses more digits than its factorization.

11811777124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250 (or 1118 counting only the distinct ones).

The product of its digits is 21952, while the sum is 40.

The spelling of 11811777124 in words is "eleven billion, eight hundred eleven million, seven hundred seventy-seven thousand, one hundred twenty-four".