6661529910 has 160 divisors (see below), whose sum is σ = 20889633600. Its totient is φ = 1522571904.

The previous prime is 6661529909. The next prime is 6661529911. The reversal of 6661529910 is 199251666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6661529909) and next prime (6661529911).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661529911) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 265842 + ... + 289818.

It is an arithmetic number, because the mean of its divisors is an integer number (130560210).

Almost surely, 2^6661529910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6661529910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10444816800).

6661529910 is an abundant number, since it is smaller than the sum of its proper divisors (14228103690).

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

6661529910 is a wasteful number, since it uses less digits than its factorization.

6661529910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24017 (or 23994 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 6661529910 is about 81618.1959491877. The cubic root of 6661529910 is about 1881.5885462472.

The spelling of 6661529910 in words is "six billion, six hundred sixty-one million, five hundred twenty-nine thousand, nine hundred ten".