669771551 has 2 divisors, whose sum is σ = 669771552. Its totient is φ = 669771550.

The previous prime is 669771541. The next prime is 669771589. The reversal of 669771551 is 155177966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669771551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669771496 and 669771505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669771511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334885775 + 334885776.

It is an arithmetic number, because the mean of its divisors is an integer number (334885776).

Almost surely, 2^669771551 is an apocalyptic number.

669771551 is a deficient number, since it is larger than the sum of its proper divisors (1).

669771551 is an equidigital number, since it uses as much as digits as its factorization.

669771551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 47.

The square root of 669771551 is about 25879.9449574376. The cubic root of 669771551 is about 874.9345479205.

The spelling of 669771551 in words is "six hundred sixty-nine million, seven hundred seventy-one thousand, five hundred fifty-one".