669977771 has 2 divisors, whose sum is σ = 669977772. Its totient is φ = 669977770.

The previous prime is 669977731. The next prime is 669977773. The reversal of 669977771 is 177779966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669977771 - 2¹⁴ = 669961387 is a prime.

Together with 669977773, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669977771.

It is not a weakly prime, because it can be changed into another prime (669977773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334988885 + 334988886.

It is an arithmetic number, because the mean of its divisors is an integer number (334988886).

Almost surely, 2^669977771 is an apocalyptic number.

669977771 is a deficient number, since it is larger than the sum of its proper divisors (1).

669977771 is an equidigital number, since it uses as much as digits as its factorization.

669977771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7001316, while the sum is 59.

The square root of 669977771 is about 25883.9288169319. The cubic root of 669977771 is about 875.0243349967.

The spelling of 669977771 in words is "six hundred sixty-nine million, nine hundred seventy-seven thousand, seven hundred seventy-one".