669515501 has 2 divisors, whose sum is σ = 669515502. Its totient is φ = 669515500.

The previous prime is 669515459. The next prime is 669515507. The reversal of 669515501 is 105515966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612513001 + 57002500 = 24749^2 + 7550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669515501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669515507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334757750 + 334757751.

It is an arithmetic number, because the mean of its divisors is an integer number (334757751).

Almost surely, 2^669515501 is an apocalyptic number.

It is an amenable number.

669515501 is a deficient number, since it is larger than the sum of its proper divisors (1).

669515501 is an equidigital number, since it uses as much as digits as its factorization.

669515501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 669515501 is about 25874.9976038646. The cubic root of 669515501 is about 874.8230394791.

The spelling of 669515501 in words is "six hundred sixty-nine million, five hundred fifteen thousand, five hundred one".