2521745617 has 4 divisors (see below), whose sum is σ = 2522578996. Its totient is φ = 2520912240.

The previous prime is 2521745593. The next prime is 2521745657. The reversal of 2521745617 is 7165471252.

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 1935912001 + 585833616 = 43999^2 + 24204^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521745617 - 2³¹ = 374261969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2521745617.

It is not an unprimeable number, because it can be changed into a prime (2521745657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412134 + ... + 418207.

It is an arithmetic number, because the mean of its divisors is an integer number (630644749).

Almost surely, 2^2521745617 is an apocalyptic number.

It is an amenable number.

2521745617 is a deficient number, since it is larger than the sum of its proper divisors (833379).

2521745617 is an equidigital number, since it uses as much as digits as its factorization.

2521745617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833378.

The product of its digits is 117600, while the sum is 40.

The square root of 2521745617 is about 50216.9853436066. The cubic root of 2521745617 is about 1361.1325659797.

The spelling of 2521745617 in words is "two billion, five hundred twenty-one million, seven hundred forty-five thousand, six hundred seventeen".