252643178567 has 4 divisors (see below), whose sum is σ = 272077269240. Its totient is φ = 233209087896.

The previous prime is 252643178563. The next prime is 252643178587. The reversal of 252643178567 is 765871346252.

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 252643178567 - 2² = 252643178563 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 (252643178561) 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, 9717045317 + ... + 9717045342.

It is an arithmetic number, because the mean of its divisors is an integer number (68019317310).

Almost surely, 2^252643178567 is an apocalyptic number.

252643178567 is a deficient number, since it is larger than the sum of its proper divisors (19434090673).

252643178567 is a wasteful number, since it uses less digits than its factorization.

252643178567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19434090672.

The product of its digits is 16934400, while the sum is 56.

The spelling of 252643178567 in words is "two hundred fifty-two billion, six hundred forty-three million, one hundred seventy-eight thousand, five hundred sixty-seven".