686630273522 has 54 divisors (see below), whose sum is σ = 1093202763111. Its totient is φ = 323433912000.

The previous prime is 686630273489. The next prime is 686630273551. The reversal of 686630273522 is 225372036686.

It can be written as a sum of positive squares in 5 ways, for example, as 978375841 + 685651897681 = 31279^2 + 828041^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=585931.

It is a super-2 number, since 2×686630273522² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1489436372 + ... + 1489436832.

Almost surely, 2^686630273522 is an apocalyptic number.

686630273522 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

686630273522 is a deficient number, since it is larger than the sum of its proper divisors (406572489589).

686630273522 is an frugal number, since it uses more digits than its factorization.

686630273522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 50.

Multiplying 686630273522 by its sum of digits (50), we get a square (34331513676100 = 5859310²).

The spelling of 686630273522 in words is "six hundred eighty-six billion, six hundred thirty million, two hundred seventy-three thousand, five hundred twenty-two".