266404990664 has 16 divisors (see below), whose sum is σ = 499515191820. Its totient is φ = 133200939520.

The previous prime is 266404990661. The next prime is 266404990667. The reversal of 266404990664 is 466099404662.

It is an interprime number because it is at equal distance from previous prime (266404990661) and next prime (266404990667).

It can be written as a sum of positive squares in 2 ways, for example, as 228524153764 + 37880836900 = 478042^2 + 194630^2 .

It is not an unprimeable number, because it can be changed into a prime (266404990661) 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, 887072 + ... + 1148784.

Almost surely, 2^266404990664 is an apocalyptic number.

It is an amenable number.

266404990664 is a deficient number, since it is larger than the sum of its proper divisors (233110201156).

266404990664 is a wasteful number, since it uses less digits than its factorization.

266404990664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388960 (or 388956 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 56.

The spelling of 266404990664 in words is "two hundred sixty-six billion, four hundred four million, nine hundred ninety thousand, six hundred sixty-four".