2154008800665 has 48 divisors (see below), whose sum is σ = 3760488800640. Its totient is φ = 1140562563840.

The previous prime is 2154008800651. The next prime is 2154008800717. The reversal of 2154008800665 is 5660088004512.

2154008800665 is a `hidden beast` number, since 21 + 540 + 0 + 8 + 80 + 0 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 2154008800665 - 2⁵ = 2154008800633 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 2154008800665.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3606124 + ... + 4160786.

It is an arithmetic number, because the mean of its divisors is an integer number (78343516680).

Almost surely, 2^{2154008800665} is an apocalyptic number.

It is an amenable number.

2154008800665 is a deficient number, since it is larger than the sum of its proper divisors (1606479999975).

2154008800665 is a wasteful number, since it uses less digits than its factorization.

2154008800665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555294 (or 555291 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 2154008800665 in words is "two trillion, one hundred fifty-four billion, eight million, eight hundred thousand, six hundred sixty-five".