2545783665 has 16 divisors (see below), whose sum is σ = 4078448448. Its totient is φ = 1356019776.

The previous prime is 2545783663. The next prime is 2545783673. The reversal of 2545783665 is 5663875452.

It is not a de Polignac number, because 2545783665 - 2¹ = 2545783663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2545783663) 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 15 ways as a sum of consecutive naturals, for example, 96022 + ... + 119631.

It is an arithmetic number, because the mean of its divisors is an integer number (254903028).

Almost surely, 2^2545783665 is an apocalyptic number.

It is an amenable number.

2545783665 is a deficient number, since it is larger than the sum of its proper divisors (1532664783).

2545783665 is a wasteful number, since it uses less digits than its factorization.

2545783665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216448.

The product of its digits is 6048000, while the sum is 51.

The square root of 2545783665 is about 50455.7594829371. The cubic root of 2545783665 is about 1365.4438063652.

The spelling of 2545783665 in words is "two billion, five hundred forty-five million, seven hundred eighty-three thousand, six hundred sixty-five".