666873503 has 2 divisors, whose sum is σ = 666873504. Its totient is φ = 666873502.

The previous prime is 666873499. The next prime is 666873511. The reversal of 666873503 is 305378666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666873503 - 2² = 666873499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666873593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333436751 + 333436752.

It is an arithmetic number, because the mean of its divisors is an integer number (333436752).

Almost surely, 2^666873503 is an apocalyptic number.

666873503 is a deficient number, since it is larger than the sum of its proper divisors (1).

666873503 is an equidigital number, since it uses as much as digits as its factorization.

666873503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 44.

The square root of 666873503 is about 25823.8940324654. The cubic root of 666873503 is about 873.6707994848.

The spelling of 666873503 in words is "six hundred sixty-six million, eight hundred seventy-three thousand, five hundred three".