266656420 has 24 divisors (see below), whose sum is σ = 578043648. Its totient is φ = 103221600.

The previous prime is 266656417. The next prime is 266656471. The reversal of 266656420 is 24656662.

It is a happy number.

It is a super-2 number, since 2×266656420² = 142211292654432800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266656420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214426 + ... + 215665.

It is an arithmetic number, because the mean of its divisors is an integer number (24085152).

Almost surely, 2^266656420 is an apocalyptic number.

266656420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266656420 is an abundant number, since it is smaller than the sum of its proper divisors (311387228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266656420 is a wasteful number, since it uses less digits than its factorization.

266656420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430131 (or 430129 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 266656420 is about 16329.6178767294. The cubic root of 266656420 is about 643.6513454249.

The spelling of 266656420 in words is "two hundred sixty-six million, six hundred fifty-six thousand, four hundred twenty".