10666259646 has 128 divisors (see below), whose sum is σ = 26605117440. Its totient is φ = 2781622272.

The previous prime is 10666259633. The next prime is 10666259647. The reversal of 10666259646 is 64695266601.

It is a super-2 number, since 2×10666259646² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10666259647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3366355 + ... + 3369521.

It is an arithmetic number, because the mean of its divisors is an integer number (207852480).

Almost surely, 2^10666259646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10666259646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13302558720).

10666259646 is an abundant number, since it is smaller than the sum of its proper divisors (15938857794).

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

10666259646 is a wasteful number, since it uses less digits than its factorization.

10666259646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 10666259646 in words is "ten billion, six hundred sixty-six million, two hundred fifty-nine thousand, six hundred forty-six".