669542413 has 2 divisors, whose sum is σ = 669542414. Its totient is φ = 669542412.

The previous prime is 669542411. The next prime is 669542429. The reversal of 669542413 is 314245966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597411364 + 72131049 = 24442^2 + 8493^2 .

It is a cyclic number.

It is not a de Polignac number, because 669542413 - 2¹ = 669542411 is a prime.

Together with 669542411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669542411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334771206 + 334771207.

It is an arithmetic number, because the mean of its divisors is an integer number (334771207).

Almost surely, 2^669542413 is an apocalyptic number.

It is an amenable number.

669542413 is a deficient number, since it is larger than the sum of its proper divisors (1).

669542413 is an equidigital number, since it uses as much as digits as its factorization.

669542413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 669542413 is about 25875.5176373343. The cubic root of 669542413 is about 874.8347608518.

The spelling of 669542413 in words is "six hundred sixty-nine million, five hundred forty-two thousand, four hundred thirteen".