681678811 has 4 divisors (see below), whose sum is σ = 743649624. Its totient is φ = 619708000.

The previous prime is 681678769. The next prime is 681678817. The reversal of 681678811 is 118876186.

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 681678811 - 2⁹ = 681678299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681678817) 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, 30985390 + ... + 30985411.

It is an arithmetic number, because the mean of its divisors is an integer number (185912406).

Almost surely, 2^681678811 is an apocalyptic number.

681678811 is a deficient number, since it is larger than the sum of its proper divisors (61970813).

681678811 is a wasteful number, since it uses less digits than its factorization.

681678811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61970812.

The product of its digits is 129024, while the sum is 46.

The square root of 681678811 is about 26108.9795089735. The cubic root of 681678811 is about 880.0890108827.

The spelling of 681678811 in words is "six hundred eighty-one million, six hundred seventy-eight thousand, eight hundred eleven".