686376266 has 4 divisors (see below), whose sum is σ = 1029564402. Its totient is φ = 343188132.

The previous prime is 686376247. The next prime is 686376269. The reversal of 686376266 is 662673686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662673686 = 2 ⋅331336843.

It can be written as a sum of positive squares in only one way, i.e., 671898241 + 14478025 = 25921^2 + 3805^2 .

It is a super-2 number, since 2×686376266² = 942224757056205512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686376269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171594065 + ... + 171594068.

Almost surely, 2^686376266 is an apocalyptic number.

686376266 is a deficient number, since it is larger than the sum of its proper divisors (343188136).

686376266 is a wasteful number, since it uses less digits than its factorization.

686376266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343188135.

The product of its digits is 2612736, while the sum is 50.

The square root of 686376266 is about 26198.7836740563. The cubic root of 686376266 is about 882.1059522075.

The spelling of 686376266 in words is "six hundred eighty-six million, three hundred seventy-six thousand, two hundred sixty-six".