678533294691 has 18 divisors (see below), whose sum is σ = 1140120570732. Its totient is φ = 387733311000.

The previous prime is 678533294671. The next prime is 678533294741. The reversal of 678533294691 is 196492335876.

678533294691 is a `hidden beast` number, since 6 + 7 + 8 + 533 + 2 + 9 + 4 + 6 + 91 = 666.

It is not a de Polignac number, because 678533294691 - 2⁷ = 678533294563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (678533294651) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 769311685 + ... + 769312566.

Almost surely, 2^678533294691 is an apocalyptic number.

678533294691 is a deficient number, since it is larger than the sum of its proper divisors (461587276041).

678533294691 is a wasteful number, since it uses less digits than its factorization.

678533294691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538624271 (or 1538624261 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The spelling of 678533294691 in words is "six hundred seventy-eight billion, five hundred thirty-three million, two hundred ninety-four thousand, six hundred ninety-one".