685806551145 has 40 divisors (see below), whose sum is σ = 1232796438720. Its totient is φ = 364744576800.

The previous prime is 685806551107. The next prime is 685806551149. The reversal of 685806551145 is 541155608586.

685806551145 is a `hidden beast` number, since 6 + 8 + 5 + 80 + 6 + 5 + 511 + 45 = 666.

It is not a de Polignac number, because 685806551145 - 2¹⁴ = 685806534761 is a prime.

It is a super-2 number, since 2×685806551145² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685806551091 and 685806551100.

It is not an unprimeable number, because it can be changed into a prime (685806551149) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2213031 + ... + 2503820.

It is an arithmetic number, because the mean of its divisors is an integer number (30819910968).

Almost surely, 2^685806551145 is an apocalyptic number.

It is an amenable number.

685806551145 is a deficient number, since it is larger than the sum of its proper divisors (546989887575).

685806551145 is a wasteful number, since it uses less digits than its factorization.

685806551145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717227 (or 4717218 counting only the distinct ones).

The product of its (nonzero) digits is 5760000, while the sum is 54.

The spelling of 685806551145 in words is "six hundred eighty-five billion, eight hundred six million, five hundred fifty-one thousand, one hundred forty-five".