2155639137120 has 768 divisors, whose sum is σ = 8915961600000. Its totient is φ = 476178186240.

The previous prime is 2155639137023. The next prime is 2155639137121. The reversal of 2155639137120 is 217319365512.

2155639137120 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 639 + 1 + 3 + 7 + 1 + 2 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155639137121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 132654756 + ... + 132671004.

It is an arithmetic number, because the mean of its divisors is an integer number (11609325000).

Almost surely, 2^{2155639137120} is an apocalyptic number.

2155639137120 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 2155639137120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4457980800000).

2155639137120 is an abundant number, since it is smaller than the sum of its proper divisors (6760322462880).

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

2155639137120 is a wasteful number, since it uses less digits than its factorization.

2155639137120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16428 (or 16414 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 2155639137120 in words is "two trillion, one hundred fifty-five billion, six hundred thirty-nine million, one hundred thirty-seven thousand, one hundred twenty".