6661660514 has 4 divisors (see below), whose sum is σ = 9992490774. Its totient is φ = 3330830256.

The previous prime is 6661660513. The next prime is 6661660517. The reversal of 6661660514 is 4150661666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6628402225 + 33258289 = 81415^2 + 5767^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6661660513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665415127 + ... + 1665415130.

Almost surely, 2^6661660514 is an apocalyptic number.

6661660514 is a deficient number, since it is larger than the sum of its proper divisors (3330830260).

6661660514 is a wasteful number, since it uses less digits than its factorization.

6661660514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330830259.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 6661660514 is about 81618.9960364620. The cubic root of 6661660514 is about 1881.6008427911.

The spelling of 6661660514 in words is "six billion, six hundred sixty-one million, six hundred sixty thousand, five hundred fourteen".