6664527690 has 64 divisors (see below), whose sum is σ = 16635317760. Its totient is φ = 1707264000.

The previous prime is 6664527643. The next prime is 6664527707. The reversal of 6664527690 is 967254666.

It is a happy number.

It is a super-2 number, since 2×6664527690² = 88831858661553472200, which contains 22 as substring.

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, 49690 + ... + 125690.

It is an arithmetic number, because the mean of its divisors is an integer number (259926840).

Almost surely, 2^6664527690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664527690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8317658880).

6664527690 is an abundant number, since it is smaller than the sum of its proper divisors (9970790070).

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

6664527690 is a wasteful number, since it uses less digits than its factorization.

6664527690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76127.

The product of its (nonzero) digits is 3265920, while the sum is 51.

The square root of 6664527690 is about 81636.5585384391. The cubic root of 6664527690 is about 1881.8707508202.

The spelling of 6664527690 in words is "six billion, six hundred sixty-four million, five hundred twenty-seven thousand, six hundred ninety".