686821153009 has 2 divisors, whose sum is σ = 686821153010. Its totient is φ = 686821153008.

The previous prime is 686821153001. The next prime is 686821153063. The reversal of 686821153009 is 900351128686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544614480400 + 142206672609 = 737980^2 + 377103^2 .

It is a cyclic number.

It is not a de Polignac number, because 686821153009 - 2³ = 686821153001 is a prime.

It is a super-2 number, since 2×686821153009² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686821153001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343410576504 + 343410576505.

It is an arithmetic number, because the mean of its divisors is an integer number (343410576505).

Almost surely, 2^686821153009 is an apocalyptic number.

It is an amenable number.

686821153009 is a deficient number, since it is larger than the sum of its proper divisors (1).

686821153009 is an equidigital number, since it uses as much as digits as its factorization.

686821153009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 686821153009 in words is "six hundred eighty-six billion, eight hundred twenty-one million, one hundred fifty-three thousand, nine".