8155801339920 has 240 divisors, whose sum is σ = 29505782884032. Its totient is φ = 2006971499520.

The previous prime is 8155801339913. The next prime is 8155801339993. The reversal of 8155801339920 is 299331085518.

8155801339920 is a `hidden beast` number, since 8 + 1 + 5 + 580 + 1 + 3 + 39 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31047367 + ... + 31308953.

Almost surely, 2^{8155801339920} is an apocalyptic number.

8155801339920 is a gapful number since it is divisible by the number (80) 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 8155801339920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14752891442016).

8155801339920 is an abundant number, since it is smaller than the sum of its proper divisors (21349981544112).

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

8155801339920 is a wasteful number, since it uses less digits than its factorization.

8155801339920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264950 (or 264941 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 8155801339920 in words is "eight trillion, one hundred fifty-five billion, eight hundred one million, three hundred thirty-nine thousand, nine hundred twenty".