6664611251 has 2 divisors, whose sum is σ = 6664611252. Its totient is φ = 6664611250.

The previous prime is 6664611241. The next prime is 6664611253. The reversal of 6664611251 is 1521164666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6664611251 - 2²² = 6660416947 is a prime.

Together with 6664611253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6664611253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332305625 + 3332305626.

It is an arithmetic number, because the mean of its divisors is an integer number (3332305626).

Almost surely, 2^6664611251 is an apocalyptic number.

6664611251 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664611251 is an equidigital number, since it uses as much as digits as its factorization.

6664611251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 6664611251 is about 81637.0703234750. The cubic root of 6664611251 is about 1881.8786158609.

The spelling of 6664611251 in words is "six billion, six hundred sixty-four million, six hundred eleven thousand, two hundred fifty-one".