686232778011 has 8 divisors (see below), whose sum is σ = 998156768064. Its totient is φ = 415898653320.

The previous prime is 686232778003. The next prime is 686232778039. The reversal of 686232778011 is 110877232686.

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

It is not a de Polignac number, because 686232778011 - 2³ = 686232778003 is a prime.

It is a super-2 number, since 2×686232778011² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686232771011) 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, 10397466301 + ... + 10397466366.

It is an arithmetic number, because the mean of its divisors is an integer number (124769596008).

Almost surely, 2^686232778011 is an apocalyptic number.

686232778011 is a deficient number, since it is larger than the sum of its proper divisors (311923990053).

686232778011 is a wasteful number, since it uses less digits than its factorization.

686232778011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20794932681.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 686232778011 in words is "six hundred eighty-six billion, two hundred thirty-two million, seven hundred seventy-eight thousand, eleven".