2155543544520 has 192 divisors, whose sum is σ = 7182712817280. Its totient is φ = 560325685248.

The previous prime is 2155543544507. The next prime is 2155543544597. The reversal of 2155543544520 is 254453455512.

2155543544520 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 54 + 3 + 544 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7648024 + ... + 7924856.

It is an arithmetic number, because the mean of its divisors is an integer number (37409962590).

Almost surely, 2^{2155543544520} is an apocalyptic number.

2155543544520 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 2155543544520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3591356408640).

2155543544520 is an abundant number, since it is smaller than the sum of its proper divisors (5027169272760).

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

2155543544520 is a wasteful number, since it uses less digits than its factorization.

2155543544520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277396 (or 277389 counting only the distinct ones).

The product of its (nonzero) digits is 2400000, while the sum is 45.

The spelling of 2155543544520 in words is "two trillion, one hundred fifty-five billion, five hundred forty-three million, five hundred forty-four thousand, five hundred twenty".