669015493 has 2 divisors, whose sum is σ = 669015494. Its totient is φ = 669015492.

The previous prime is 669015481. The next prime is 669015497. The reversal of 669015493 is 394510966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609447969 + 59567524 = 24687^2 + 7718^2 .

It is a cyclic number.

It is not a de Polignac number, because 669015493 - 2¹⁷ = 668884421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669015497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334507746 + 334507747.

It is an arithmetic number, because the mean of its divisors is an integer number (334507747).

Almost surely, 2^669015493 is an apocalyptic number.

It is an amenable number.

669015493 is a deficient number, since it is larger than the sum of its proper divisors (1).

669015493 is an equidigital number, since it uses as much as digits as its factorization.

669015493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 669015493 is about 25865.3338080142. Note that the first 3 decimals coincide. The cubic root of 669015493 is about 874.6052066065.

The spelling of 669015493 in words is "six hundred sixty-nine million, fifteen thousand, four hundred ninety-three".