245642637791 has 4 divisors (see below), whose sum is σ = 246051361584. Its totient is φ = 245233914000.

The previous prime is 245642637763. The next prime is 245642637839. The reversal of 245642637791 is 197736246542.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 245642637791 - 2³⁴ = 228462768607 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 (245642637991) 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, 204360995 + ... + 204362196.

It is an arithmetic number, because the mean of its divisors is an integer number (61512840396).

Almost surely, 2^245642637791 is an apocalyptic number.

245642637791 is a deficient number, since it is larger than the sum of its proper divisors (408723793).

245642637791 is an equidigital number, since it uses as much as digits as its factorization.

245642637791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408723792.

The product of its digits is 15240960, while the sum is 56.

The spelling of 245642637791 in words is "two hundred forty-five billion, six hundred forty-two million, six hundred thirty-seven thousand, seven hundred ninety-one".