678757891823 has 4 divisors (see below), whose sum is σ = 740463154728. Its totient is φ = 617052628920.

The previous prime is 678757891807. The next prime is 678757891901. The reversal of 678757891823 is 328198757876.

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 678757891823 - 2⁴ = 678757891807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678757897823) 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, 30852631436 + ... + 30852631457.

It is an arithmetic number, because the mean of its divisors is an integer number (185115788682).

Almost surely, 2^678757891823 is an apocalyptic number.

678757891823 is a deficient number, since it is larger than the sum of its proper divisors (61705262905).

678757891823 is a wasteful number, since it uses less digits than its factorization.

678757891823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61705262904.

The product of its digits is 284497920, while the sum is 71.

The spelling of 678757891823 in words is "six hundred seventy-eight billion, seven hundred fifty-seven million, eight hundred ninety-one thousand, eight hundred twenty-three".