266040006440 has 32 divisors (see below), whose sum is σ = 644635401480. Its totient is φ = 98230156032.

The previous prime is 266040006413. The next prime is 266040006461. The reversal of 266040006440 is 44600040662.

It can be written as a sum of positive squares in 4 ways, for example, as 230033425924 + 36006580516 = 479618^2 + 189754^2 .

It is a junction number, because it is equal to n+sod(n) for n = 266040006397 and 266040006406.

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, 255807179 + ... + 255808218.

Almost surely, 2^266040006440 is an apocalyptic number.

266040006440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266040006440 is an abundant number, since it is smaller than the sum of its proper divisors (378595395040).

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

266040006440 is a wasteful number, since it uses less digits than its factorization.

266040006440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511615421 (or 511615417 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 266040006440 in words is "two hundred sixty-six billion, forty million, six thousand, four hundred forty".