266439125691648 has 432 divisors, whose sum is σ = 947531279618560. Its totient is φ = 70117863653376.

The previous prime is 266439125691569. The next prime is 266439125691659. The reversal of 266439125691648 is 846196521934662.

It is a happy number.

266439125691648 is a `hidden beast` number, since 2 + 6 + 6 + 4 + 3 + 9 + 1 + 2 + 569 + 16 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95702088 + ... + 98446776.

Almost surely, 2^{266439125691648} is an apocalyptic number.

266439125691648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266439125691648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (473765639809280).

266439125691648 is an abundant number, since it is smaller than the sum of its proper divisors (681092153926912).

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

266439125691648 is a wasteful number, since it uses less digits than its factorization.

266439125691648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745194 (or 2745177 counting only the distinct ones).

The product of its digits is 806215680, while the sum is 72.

The spelling of 266439125691648 in words is "two hundred sixty-six trillion, four hundred thirty-nine billion, one hundred twenty-five million, six hundred ninety-one thousand, six hundred forty-eight".