2550820951585 has 4 divisors (see below), whose sum is σ = 3060985141908. Its totient is φ = 2040656761264.

The previous prime is 2550820951487. The next prime is 2550820951589. The reversal of 2550820951585 is 5851590280552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 696986210449 + 1853834741136 = 834857^2 + 1361556^2 .

It is a cyclic number.

It is not a de Polignac number, because 2550820951585 - 2²¹ = 2550818854433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2550820951589) 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 3 ways as a sum of consecutive naturals, for example, 255082095154 + ... + 255082095163.

It is an arithmetic number, because the mean of its divisors is an integer number (765246285477).

Almost surely, 2^{2550820951585} is an apocalyptic number.

It is an amenable number.

2550820951585 is a deficient number, since it is larger than the sum of its proper divisors (510164190323).

2550820951585 is an equidigital number, since it uses as much as digits as its factorization.

2550820951585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510164190322.

The product of its (nonzero) digits is 7200000, while the sum is 55.

The spelling of 2550820951585 in words is "two trillion, five hundred fifty billion, eight hundred twenty million, nine hundred fifty-one thousand, five hundred eighty-five".