866696544 has 192 divisors, whose sum is σ = 2951424000. Its totient is φ = 242279424.

The previous prime is 866696539. The next prime is 866696549. The reversal of 866696544 is 445696668.

866696544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (866696539) and next prime (866696549).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866696549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282732 + ... + 285780.

It is an arithmetic number, because the mean of its divisors is an integer number (15372000).

Almost surely, 2^866696544 is an apocalyptic number.

866696544 is a gapful number since it is divisible by the number (84) 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 866696544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475712000).

866696544 is an abundant number, since it is smaller than the sum of its proper divisors (2084727456).

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

866696544 is a wasteful number, since it uses less digits than its factorization.

866696544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122 (or 3108 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 866696544 is about 29439.7103246618. The cubic root of 866696544 is about 953.4304578809.

The spelling of 866696544 in words is "eight hundred sixty-six million, six hundred ninety-six thousand, five hundred forty-four".