2120646465 has 48 divisors (see below), whose sum is σ = 4211141376. Its totient is φ = 967075200.

The previous prime is 2120646383. The next prime is 2120646467. The reversal of 2120646465 is 5646460212.

2120646465 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 6 + 4 + 646 + 5 = 666.

It is not a de Polignac number, because 2120646465 - 2⁹ = 2120645953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2120646467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124620 + ... + 140610.

It is an arithmetic number, because the mean of its divisors is an integer number (87732112).

Almost surely, 2^2120646465 is an apocalyptic number.

It is an amenable number.

2120646465 is a deficient number, since it is larger than the sum of its proper divisors (2090494911).

2120646465 is a wasteful number, since it uses less digits than its factorization.

2120646465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16430 (or 16427 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 2120646465 is about 46050.4773590893. The cubic root of 2120646465 is about 1284.7622213926.

The spelling of 2120646465 in words is "two billion, one hundred twenty million, six hundred forty-six thousand, four hundred sixty-five".