245645431657 has 4 divisors (see below), whose sum is σ = 256325667840. Its totient is φ = 234965195476.

The previous prime is 245645431643. The next prime is 245645431721. The reversal of 245645431657 is 756134546542.

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 245645431657 - 2¹¹ = 245645429609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245645401657) 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, 5340118057 + ... + 5340118102.

It is an arithmetic number, because the mean of its divisors is an integer number (64081416960).

Almost surely, 2^245645431657 is an apocalyptic number.

It is an amenable number.

245645431657 is a deficient number, since it is larger than the sum of its proper divisors (10680236183).

245645431657 is a wasteful number, since it uses less digits than its factorization.

245645431657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680236182.

The product of its digits is 12096000, while the sum is 52.

The spelling of 245645431657 in words is "two hundred forty-five billion, six hundred forty-five million, four hundred thirty-one thousand, six hundred fifty-seven".