245023420561 has 4 divisors (see below), whose sum is σ = 247449395124. Its totient is φ = 242597446000.

The previous prime is 245023420507. The next prime is 245023420567. The reversal of 245023420561 is 165024320542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165024320542 = 2 ⋅82512160271.

It can be written as a sum of positive squares in 2 ways, for example, as 214762730625 + 30260689936 = 463425^2 + 173956^2 .

It is a cyclic number.

It is not a de Polignac number, because 245023420561 - 2¹³ = 245023412369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245023420567) 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, 1212987130 + ... + 1212987331.

It is an arithmetic number, because the mean of its divisors is an integer number (61862348781).

Almost surely, 2^245023420561 is an apocalyptic number.

It is an amenable number.

245023420561 is a deficient number, since it is larger than the sum of its proper divisors (2425974563).

245023420561 is a wasteful number, since it uses less digits than its factorization.

245023420561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425974562.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 245023420561 in words is "two hundred forty-five billion, twenty-three million, four hundred twenty thousand, five hundred sixty-one".