245205252521 has 4 divisors (see below), whose sum is σ = 245268995712. Its totient is φ = 245141509332.

The previous prime is 245205252499. The next prime is 245205252529. The reversal of 245205252521 is 125252502542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 245205252521 - 2¹⁸ = 245204990377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245205252529) 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, 31865825 + ... + 31873518.

It is an arithmetic number, because the mean of its divisors is an integer number (61317248928).

Almost surely, 2^245205252521 is an apocalyptic number.

It is an amenable number.

245205252521 is a deficient number, since it is larger than the sum of its proper divisors (63743191).

245205252521 is an equidigital number, since it uses as much as digits as its factorization.

245205252521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63743190.

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 245205252521 in words is "two hundred forty-five billion, two hundred five million, two hundred fifty-two thousand, five hundred twenty-one".