811681857107 has 8 divisors (see below), whose sum is σ = 885478004400. Its totient is φ = 737886857760.

The previous prime is 811681857097. The next prime is 811681857127. The reversal of 811681857107 is 701758186118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 811681857107 - 2⁶ = 811681857043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (811681857127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1948769 + ... + 2328317.

It is an arithmetic number, because the mean of its divisors is an integer number (110684750550).

Almost surely, 2^811681857107 is an apocalyptic number.

811681857107 is a deficient number, since it is larger than the sum of its proper divisors (73796147293).

811681857107 is a wasteful number, since it uses less digits than its factorization.

811681857107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573973.

The product of its (nonzero) digits is 752640, while the sum is 53.

The spelling of 811681857107 in words is "eight hundred eleven billion, six hundred eighty-one million, eight hundred fifty-seven thousand, one hundred seven".