6660253777 has 4 divisors (see below), whose sum is σ = 6681669696. Its totient is φ = 6638837860.

The previous prime is 6660253739. The next prime is 6660253793. The reversal of 6660253777 is 7773520666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7773520666 = 2 ⋅3886760333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660253777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6660253777.

It is not an unprimeable number, because it can be changed into a prime (6660253277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10707493 + ... + 10708114.

It is an arithmetic number, because the mean of its divisors is an integer number (1670417424).

Almost surely, 2^6660253777 is an apocalyptic number.

It is an amenable number.

6660253777 is a deficient number, since it is larger than the sum of its proper divisors (21415919).

6660253777 is a wasteful number, since it uses less digits than its factorization.

6660253777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21415918.

The product of its (nonzero) digits is 2222640, while the sum is 49.

The square root of 6660253777 is about 81610.3778756109. The cubic root of 6660253777 is about 1881.4683881348.

The spelling of 6660253777 in words is "six billion, six hundred sixty million, two hundred fifty-three thousand, seven hundred seventy-seven".