669436215601 has 2 divisors, whose sum is σ = 669436215602. Its totient is φ = 669436215600.

The previous prime is 669436215587. The next prime is 669436215619. The reversal of 669436215601 is 106512634966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 575876088225 + 93560127376 = 758865^2 + 305876^2 .

It is a cyclic number.

It is not a de Polignac number, because 669436215601 - 2³¹ = 667288731953 is a prime.

It is not a weakly prime, because it can be changed into another prime (669436215631) 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 as a sum of consecutive naturals, namely, 334718107800 + 334718107801.

It is an arithmetic number, because the mean of its divisors is an integer number (334718107801).

Almost surely, 2^669436215601 is an apocalyptic number.

It is an amenable number.

669436215601 is a deficient number, since it is larger than the sum of its proper divisors (1).

669436215601 is an equidigital number, since it uses as much as digits as its factorization.

669436215601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 669436215601 in words is "six hundred sixty-nine billion, four hundred thirty-six million, two hundred fifteen thousand, six hundred one".