266664464240 has 20 divisors (see below), whose sum is σ = 619994879544. Its totient is φ = 106665785664.

The previous prime is 266664464239. The next prime is 266664464251. The reversal of 266664464240 is 42464466662.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×266664464240² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666652822 + ... + 1666652981.

Almost surely, 2^266664464240 is an apocalyptic number.

266664464240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266664464240 is an abundant number, since it is smaller than the sum of its proper divisors (353330415304).

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

266664464240 is a wasteful number, since it uses less digits than its factorization.

266664464240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333305816 (or 3333305810 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 266664464240 in words is "two hundred sixty-six billion, six hundred sixty-four million, four hundred sixty-four thousand, two hundred forty".