2155533321540 has 48 divisors (see below), whose sum is σ = 6090864816960. Its totient is φ = 569535408000.

The previous prime is 2155533321523. The next prime is 2155533321551. The reversal of 2155533321540 is 451233355512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164789586 + ... + 164802665.

It is an arithmetic number, because the mean of its divisors is an integer number (126893017020).

Almost surely, 2^{2155533321540} is an apocalyptic number.

2155533321540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155533321540 is an abundant number, since it is smaller than the sum of its proper divisors (3935331495420).

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

2155533321540 is a wasteful number, since it uses less digits than its factorization.

2155533321540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329592372 (or 329592370 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 2155533321540 in words is "two trillion, one hundred fifty-five billion, five hundred thirty-three million, three hundred twenty-one thousand, five hundred forty".