2155220606430 has 96 divisors (see below), whose sum is σ = 5681110219200. Its totient is φ = 566806242816.

The previous prime is 2155220606419. The next prime is 2155220606437. The reversal of 2155220606430 is 346060225512.

2155220606430 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 2 + 2 + 0 + 6 + 0 + 643 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155220606437) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2770047 + ... + 3461733.

It is an arithmetic number, because the mean of its divisors is an integer number (59178231450).

Almost surely, 2^{2155220606430} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155220606430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2840555109600).

2155220606430 is an abundant number, since it is smaller than the sum of its proper divisors (3525889612770).

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

2155220606430 is a wasteful number, since it uses less digits than its factorization.

2155220606430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692178 (or 692175 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 2155220606430 in words is "two trillion, one hundred fifty-five billion, two hundred twenty million, six hundred six thousand, four hundred thirty".