811939685747 has 8 divisors (see below), whose sum is σ = 833918514432. Its totient is φ = 789962673600.

The previous prime is 811939685743. The next prime is 811939685759. The reversal of 811939685747 is 747586939118.

811939685747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 811939685747 - 2² = 811939685743 is a prime.

It is a super-2 number, since 2×811939685747² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811939685743) 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, 477422 + ... + 1360812.

It is an arithmetic number, because the mean of its divisors is an integer number (104239814304).

Almost surely, 2^811939685747 is an apocalyptic number.

811939685747 is a deficient number, since it is larger than the sum of its proper divisors (21978828685).

811939685747 is a wasteful number, since it uses less digits than its factorization.

811939685747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908269.

The product of its digits is 91445760, while the sum is 68.

The spelling of 811939685747 in words is "eight hundred eleven billion, nine hundred thirty-nine million, six hundred eighty-five thousand, seven hundred forty-seven".