2155072500 has 240 divisors, whose sum is σ = 7980945280. Its totient is φ = 492480000.

The previous prime is 2155072481. The next prime is 2155072501. The reversal of 2155072500 is 52705512.

It is a happy number.

2155072500 is a `hidden beast` number, since 2 + 155 + 0 + 7 + 2 + 500 = 666.

2155072500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155072501) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 470220 + ... + 474780.

Almost surely, 2^2155072500 is an apocalyptic number.

2155072500 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 2155072500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3990472640).

2155072500 is an abundant number, since it is smaller than the sum of its proper divisors (5825872780).

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

2155072500 is a wasteful number, since it uses less digits than its factorization.

2155072500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 2155072500 is about 46422.7584273059. The cubic root of 2155072500 is about 1291.6771047833.

The spelling of 2155072500 in words is "two billion, one hundred fifty-five million, seventy-two thousand, five hundred".