245661157 has 12 divisors (see below), whose sum is σ = 286556556. Its totient is φ = 209986560.

The previous prime is 245661149. The next prime is 245661173. The reversal of 245661157 is 751166542.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79405921 + 166255236 = 8911^2 + 12894^2 .

It is not a de Polignac number, because 245661157 - 2³ = 245661149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245601157) 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 11 ways as a sum of consecutive naturals, for example, 11557 + ... + 24997.

It is an arithmetic number, because the mean of its divisors is an integer number (23879713).

Almost surely, 2^245661157 is an apocalyptic number.

It is an amenable number.

245661157 is a deficient number, since it is larger than the sum of its proper divisors (40895399).

245661157 is a wasteful number, since it uses less digits than its factorization.

245661157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13828 (or 13821 counting only the distinct ones).

The product of its digits is 50400, while the sum is 37.

The square root of 245661157 is about 15673.5814988151. The cubic root of 245661157 is about 626.2948362261.

The spelling of 245661157 in words is "two hundred forty-five million, six hundred sixty-one thousand, one hundred fifty-seven".