686682077 has 2 divisors, whose sum is σ = 686682078. Its totient is φ = 686682076.

The previous prime is 686681993. The next prime is 686682121. The reversal of 686682077 is 770286686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583029316 + 103652761 = 24146^2 + 10181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686682077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686682277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343341038 + 343341039.

It is an arithmetic number, because the mean of its divisors is an integer number (343341039).

Almost surely, 2^686682077 is an apocalyptic number.

It is an amenable number.

686682077 is a deficient number, since it is larger than the sum of its proper divisors (1).

686682077 is an equidigital number, since it uses as much as digits as its factorization.

686682077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The square root of 686682077 is about 26204.6193828493. The cubic root of 686682077 is about 882.2369385016.

The spelling of 686682077 in words is "six hundred eighty-six million, six hundred eighty-two thousand, seventy-seven".