2154899565 has 192 divisors, whose sum is σ = 4823470080. Its totient is φ = 893617920.

The previous prime is 2154899557. The next prime is 2154899567. The reversal of 2154899565 is 5659984512.

2154899565 is a `hidden beast` number, since 2 + 1 + 548 + 9 + 95 + 6 + 5 = 666.

It is not a de Polignac number, because 2154899565 - 2³ = 2154899557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154899567) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 16449550 + ... + 16449680.

It is an arithmetic number, because the mean of its divisors is an integer number (25122240).

Almost surely, 2^2154899565 is an apocalyptic number.

It is an amenable number.

2154899565 is an abundant number, since it is smaller than the sum of its proper divisors (2668570515).

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

2154899565 is a wasteful number, since it uses less digits than its factorization.

2154899565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 262 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The square root of 2154899565 is about 46420.8957798102. The cubic root of 2154899565 is about 1291.6425534081.

The spelling of 2154899565 in words is "two billion, one hundred fifty-four million, eight hundred ninety-nine thousand, five hundred sixty-five".