6601811520 has 112 divisors (see below), whose sum is σ = 20977067520. Its totient is φ = 1759113216.

The previous prime is 6601811519. The next prime is 6601811527. The reversal of 6601811520 is 251181066.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (6601811527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2055676 + ... + 2058884.

Almost surely, 2^6601811520 is an apocalyptic number.

6601811520 is a gapful number since it is divisible by the number (60) 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 6601811520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10488533760).

6601811520 is an abundant number, since it is smaller than the sum of its proper divisors (14375256000).

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

6601811520 is a wasteful number, since it uses less digits than its factorization.

6601811520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5372 (or 5362 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 6601811520 is about 81251.5324163182. The cubic root of 6601811520 is about 1875.9490562526.

Adding to 6601811520 its reverse (251181066), we get a palindrome (6852992586).

The spelling of 6601811520 in words is "six billion, six hundred one million, eight hundred eleven thousand, five hundred twenty".