2154642885 has 24 divisors (see below), whose sum is σ = 3736044000. Its totient is φ = 1148733792.

The previous prime is 2154642881. The next prime is 2154642901. The reversal of 2154642885 is 5882464512.

2154642885 is a `hidden beast` number, since 2 + 1 + 546 + 4 + 28 + 85 = 666.

It is not a de Polignac number, because 2154642885 - 2² = 2154642881 is a prime.

It is a super-2 number, since 2×2154642885² = 9284971923762246450, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2154642885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154642881) 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, 152866 + ... + 166364.

It is an arithmetic number, because the mean of its divisors is an integer number (155668500).

Almost surely, 2^2154642885 is an apocalyptic number.

It is an amenable number.

2154642885 is a deficient number, since it is larger than the sum of its proper divisors (1581401115).

2154642885 is a wasteful number, since it uses less digits than its factorization.

2154642885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17057 (or 17054 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The square root of 2154642885 is about 46418.1309942570. The cubic root of 2154642885 is about 1291.5912668763.

The spelling of 2154642885 in words is "two billion, one hundred fifty-four million, six hundred forty-two thousand, eight hundred eighty-five".