2155230340550 has 48 divisors (see below), whose sum is σ = 4581521213280. Its totient is φ = 738917199360.

The previous prime is 2155230340513. The next prime is 2155230340553. The reversal of 2155230340550 is 550430325512.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 2155230340550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155230340553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24943022 + ... + 25029278.

It is an arithmetic number, because the mean of its divisors is an integer number (95448358610).

Almost surely, 2^{2155230340550} is an apocalyptic number.

2155230340550 is an abundant number, since it is smaller than the sum of its proper divisors (2426290872730).

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

2155230340550 is a wasteful number, since it uses less digits than its factorization.

2155230340550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157665 (or 157660 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The spelling of 2155230340550 in words is "two trillion, one hundred fifty-five billion, two hundred thirty million, three hundred forty thousand, five hundred fifty".