2505235524521 has 4 divisors (see below), whose sum is σ = 2505326621700. Its totient is φ = 2505144427344.

The previous prime is 2505235524509. The next prime is 2505235524527. The reversal of 2505235524521 is 1254255325052.

It is a happy number.

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 651991651600 + 1853243872921 = 807460^2 + 1361339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505235524521 - 2⁶ = 2505235524457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2505235524527) 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, 45507326 + ... + 45562343.

It is an arithmetic number, because the mean of its divisors is an integer number (626331655425).

Almost surely, 2^{2505235524521} is an apocalyptic number.

It is an amenable number.

2505235524521 is a deficient number, since it is larger than the sum of its proper divisors (91097179).

2505235524521 is an equidigital number, since it uses as much as digits as its factorization.

2505235524521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91097178.

The product of its (nonzero) digits is 600000, while the sum is 41.

The spelling of 2505235524521 in words is "two trillion, five hundred five billion, two hundred thirty-five million, five hundred twenty-four thousand, five hundred twenty-one".