266634326640 has 160 divisors (see below), whose sum is σ = 902298249216. Its totient is φ = 64596372480.

The previous prime is 266634326617. The next prime is 266634326659. The reversal of 266634326640 is 46623436662.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 266634326640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4104654 + ... + 4169106.

Almost surely, 2^266634326640 is an apocalyptic number.

266634326640 is a gapful number since it is divisible by the number (20) 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 266634326640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451149124608).

266634326640 is an abundant number, since it is smaller than the sum of its proper divisors (635663922576).

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

266634326640 is a wasteful number, since it uses less digits than its factorization.

266634326640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66047 (or 66041 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 48.

The spelling of 266634326640 in words is "two hundred sixty-six billion, six hundred thirty-four million, three hundred twenty-six thousand, six hundred forty".