2154684465 has 24 divisors (see below), whose sum is σ = 3954481128. Its totient is φ = 1081566720.

The previous prime is 2154684451. The next prime is 2154684487. The reversal of 2154684465 is 5644864512.

It is a happy number.

2154684465 is a `hidden beast` number, since 2 + 1 + 546 + 8 + 44 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 124010496 + 2030673969 = 11136^2 + 45063^2 .

It is not a de Polignac number, because 2154684465 - 2⁶ = 2154684401 is a prime.

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 2154684465.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1407526 + ... + 1409055.

It is an arithmetic number, because the mean of its divisors is an integer number (164770047).

Almost surely, 2^2154684465 is an apocalyptic number.

It is an amenable number.

2154684465 is a deficient number, since it is larger than the sum of its proper divisors (1799796663).

2154684465 is a wasteful number, since it uses less digits than its factorization.

2154684465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816609 (or 2816606 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 2154684465 is about 46418.5788774279. The cubic root of 2154684465 is about 1291.5995751393.

The spelling of 2154684465 in words is "two billion, one hundred fifty-four million, six hundred eighty-four thousand, four hundred sixty-five".