2001240155520 has 256 divisors, whose sum is σ = 7108055640000. Its totient is φ = 532133314560.

The previous prime is 2001240155479. The next prime is 2001240155539. The reversal of 2001240155520 is 255510421002.

2001240155520 is a `hidden beast` number, since 2 + 0 + 0 + 124 + 0 + 15 + 5 + 520 = 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 31 ways as a sum of consecutive naturals, for example, 5864800 + ... + 6196640.

Almost surely, 2^{2001240155520} is an apocalyptic number.

2001240155520 is a gapful number since it is divisible by the number (20) 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 2001240155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3554027820000).

2001240155520 is an abundant number, since it is smaller than the sum of its proper divisors (5106815484480).

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

2001240155520 is a wasteful number, since it uses less digits than its factorization.

2001240155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332218 (or 332200 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 2001240155520 its reverse (255510421002), we get a palindrome (2256750576522).

The spelling of 2001240155520 in words is "two trillion, one billion, two hundred forty million, one hundred fifty-five thousand, five hundred twenty".