266680688 has 20 divisors (see below), whose sum is σ = 518333640. Its totient is φ = 132917184.

The previous prime is 266680681. The next prime is 266680691. The reversal of 266680688 is 886086662.

It is a super-2 number, since 2×266680688² = 142237178704306688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266680681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21218 + ... + 31361.

It is an arithmetic number, because the mean of its divisors is an integer number (25916682).

Almost surely, 2^266680688 is an apocalyptic number.

It is an amenable number.

266680688 is a deficient number, since it is larger than the sum of its proper divisors (251652952).

266680688 is a wasteful number, since it uses less digits than its factorization.

266680688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52904 (or 52898 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 50.

The square root of 266680688 is about 16330.3609268136. The cubic root of 266680688 is about 643.6708707464.

The spelling of 266680688 in words is "two hundred sixty-six million, six hundred eighty thousand, six hundred eighty-eight".