11911445820 has 96 divisors (see below), whose sum is σ = 37328558400. Its totient is φ = 3153180672.

The previous prime is 11911445809. The next prime is 11911445839. The reversal of 11911445820 is 2854411911.

11911445820 is a `hidden beast` number, since 1 + 191 + 1 + 445 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6525 + ... + 154484.

It is an arithmetic number, because the mean of its divisors is an integer number (388839150).

Almost surely, 2^11911445820 is an apocalyptic number.

11911445820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11911445820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18664279200).

11911445820 is an abundant number, since it is smaller than the sum of its proper divisors (25417112580).

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

11911445820 is a wasteful number, since it uses less digits than its factorization.

11911445820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161164 (or 161156 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 11911445820 in words is "eleven billion, nine hundred eleven million, four hundred forty-five thousand, eight hundred twenty".