1678235250509 has 4 divisors (see below), whose sum is σ = 1678237886304. Its totient is φ = 1678232614716.

The previous prime is 1678235250481. The next prime is 1678235250511. The reversal of 1678235250509 is 9050525328761.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1678235250509 - 2¹⁶ = 1678235184973 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 (1678235250589) 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, 295784 + ... + 1855790.

It is an arithmetic number, because the mean of its divisors is an integer number (419559471576).

Almost surely, 2^{1678235250509} is an apocalyptic number.

It is an amenable number.

1678235250509 is a deficient number, since it is larger than the sum of its proper divisors (2635795).

1678235250509 is a wasteful number, since it uses less digits than its factorization.

1678235250509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635794.

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 1678235250509 in words is "one trillion, six hundred seventy-eight billion, two hundred thirty-five million, two hundred fifty thousand, five hundred nine".