11781035520 has 160 divisors (see below), whose sum is σ = 37940794848. Its totient is φ = 3118399488.

The previous prime is 11781035509. The next prime is 11781035533. The reversal of 11781035520 is 2553018711.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1046562 + ... + 1057758.

Almost surely, 2^11781035520 is an apocalyptic number.

11781035520 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 11781035520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18970397424).

11781035520 is an abundant number, since it is smaller than the sum of its proper divisors (26159759328).

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

11781035520 is a wasteful number, since it uses less digits than its factorization.

11781035520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11360 (or 11344 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 33.

The spelling of 11781035520 in words is "eleven billion, seven hundred eighty-one million, thirty-five thousand, five hundred twenty".