245122985581 has 4 divisors (see below), whose sum is σ = 245140000000. Its totient is φ = 245105971164.

The previous prime is 245122985563. The next prime is 245122985651. The reversal of 245122985581 is 185589221542.

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 245122985581 - 2⁹ = 245122985069 is a prime.

It is a super-2 number, since 2×245122985581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245122985881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8485581 + ... + 8514418.

It is an arithmetic number, because the mean of its divisors is an integer number (61285000000).

Almost surely, 2^245122985581 is an apocalyptic number.

It is an amenable number.

245122985581 is a deficient number, since it is larger than the sum of its proper divisors (17014419).

245122985581 is a wasteful number, since it uses less digits than its factorization.

245122985581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17014418.

The product of its digits is 2304000, while the sum is 52.

The spelling of 245122985581 in words is "two hundred forty-five billion, one hundred twenty-two million, nine hundred eighty-five thousand, five hundred eighty-one".