685136388711 has 8 divisors (see below), whose sum is σ = 913530536944. Its totient is φ = 456749916480.

The previous prime is 685136388667. The next prime is 685136388737. The reversal of 685136388711 is 117883631586.

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

It is not a de Polignac number, because 685136388711 - 2²¹ = 685134291559 is a prime.

It is a super-2 number, since 2×685136388711² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685136388791) 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, 1707400 + ... + 2070141.

It is an arithmetic number, because the mean of its divisors is an integer number (114191317118).

Almost surely, 2^685136388711 is an apocalyptic number.

685136388711 is a deficient number, since it is larger than the sum of its proper divisors (228394148233).

685136388711 is a wasteful number, since it uses less digits than its factorization.

685136388711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838001.

The product of its digits is 5806080, while the sum is 57.

The spelling of 685136388711 in words is "six hundred eighty-five billion, one hundred thirty-six million, three hundred eighty-eight thousand, seven hundred eleven".