2154565655220 has 288 divisors, whose sum is σ = 6997283274240. Its totient is φ = 489900096000.

The previous prime is 2154565655167. The next prime is 2154565655243. The reversal of 2154565655220 is 225565654512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2154565655220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 127912119 + ... + 127928961.

It is an arithmetic number, because the mean of its divisors is an integer number (24296122480).

Almost surely, 2^{2154565655220} is an apocalyptic number.

2154565655220 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 2154565655220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3498641637120).

2154565655220 is an abundant number, since it is smaller than the sum of its proper divisors (4842717619020).

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

2154565655220 is a wasteful number, since it uses less digits than its factorization.

2154565655220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17087 (or 16984 counting only the distinct ones).

The product of its (nonzero) digits is 3600000, while the sum is 48.

The spelling of 2154565655220 in words is "two trillion, one hundred fifty-four billion, five hundred sixty-five million, six hundred fifty-five thousand, two hundred twenty".