245225261691 has 48 divisors (see below), whose sum is σ = 360752745600. Its totient is φ = 160494973056.

The previous prime is 245225261689. The next prime is 245225261717. The reversal of 245225261691 is 196162522542.

245225261691 is a `hidden beast` number, since 2 + 4 + 5 + 2 + 25 + 2 + 616 + 9 + 1 = 666.

It is not a de Polignac number, because 245225261691 - 2¹ = 245225261689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245225261651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161013856 + ... + 161015378.

It is an arithmetic number, because the mean of its divisors is an integer number (7515682200).

Almost surely, 2^245225261691 is an apocalyptic number.

245225261691 is a deficient number, since it is larger than the sum of its proper divisors (115527483909).

245225261691 is a wasteful number, since it uses less digits than its factorization.

245225261691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920 (or 2917 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 245225261691 in words is "two hundred forty-five billion, two hundred twenty-five million, two hundred sixty-one thousand, six hundred ninety-one".