11800520640 has 280 divisors, whose sum is σ = 42207862752. Its totient is φ = 3129477120.

The previous prime is 11800520639. The next prime is 11800520671. The reversal of 11800520640 is 4602500811.

11800520640 is a `hidden beast` number, since 1 + 1 + 80 + 0 + 520 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5105085 + ... + 5107395.

Almost surely, 2^11800520640 is an apocalyptic number.

11800520640 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 11800520640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21103931376).

11800520640 is an abundant number, since it is smaller than the sum of its proper divisors (30407342112).

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

11800520640 is a wasteful number, since it uses less digits than its factorization.

11800520640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537 (or 2518 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 11800520640 in words is "eleven billion, eight hundred million, five hundred twenty thousand, six hundred forty".