2520251765 has 4 divisors (see below), whose sum is σ = 3024302124. Its totient is φ = 2016201408.

The previous prime is 2520251761. The next prime is 2520251791. The reversal of 2520251765 is 5671520252.

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 1404825361 + 1115426404 = 37481^2 + 33398^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520251765 - 2² = 2520251761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520251761) 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, 252025172 + ... + 252025181.

It is an arithmetic number, because the mean of its divisors is an integer number (756075531).

Almost surely, 2^2520251765 is an apocalyptic number.

It is an amenable number.

2520251765 is a deficient number, since it is larger than the sum of its proper divisors (504050359).

2520251765 is an equidigital number, since it uses as much as digits as its factorization.

2520251765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504050358.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 2520251765 is about 50202.1091688387. The cubic root of 2520251765 is about 1360.8637399951.

It can be divided in two parts, 25202 and 51765, that added together give a palindrome (76967).

The spelling of 2520251765 in words is "two billion, five hundred twenty million, two hundred fifty-one thousand, seven hundred sixty-five".