1245823242161 has 4 divisors (see below), whose sum is σ = 1257252813300. Its totient is φ = 1234393671024.

The previous prime is 1245823242121. The next prime is 1245823242221. The reversal of 1245823242161 is 1612423285421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 759435559936 + 486387682225 = 871456^2 + 697415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245823242161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245823242121) 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 3 ways as a sum of consecutive naturals, for example, 5714785406 + ... + 5714785623.

It is an arithmetic number, because the mean of its divisors is an integer number (314313203325).

Almost surely, 2^{1245823242161} is an apocalyptic number.

It is an amenable number.

1245823242161 is a deficient number, since it is larger than the sum of its proper divisors (11429571139).

1245823242161 is a wasteful number, since it uses less digits than its factorization.

1245823242161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11429571138.

The product of its digits is 184320, while the sum is 41.

The spelling of 1245823242161 in words is "one trillion, two hundred forty-five billion, eight hundred twenty-three million, two hundred forty-two thousand, one hundred sixty-one".